Pregnancy test negative 6 days before period

Y​ou may suspect that you are pregnant when you have unusual symptoms of pregnancy or if you have missed your period. If you have regular periods and have missed your period by a week, it is likely that you are pregnant. However, if you have irregular menstrual cycles, look out for other symptoms of pregnancy​. 

For a start, confirm your suspicion by buying an over-the-counter urine pregnancy test kit. There are many brands of pregnancy test kits available in the market, which are quite reliable. These are available at our local pharmacies. Alternatively, you could go to your doctor for a test.​ 

What is a Pregnancy Test Kit? 

During pregnancy, a hormone called human chorionic gonadotrophin (hCG) is produced, which circulates in the blood and is also present in the urine. 

The pregnancy test kit detects the presence of hCG in your urine. It is a qualitative test. Some pregnancy test kits are more sensitive than the others but most will be​ ​​​able to detect hCG between the fourth to fifth week of your pregnancy. This means that for those with regular cycles, the test should be positive once you have missed your period by a few days. 

Although almost all over-the counter pregnancy test kits detect pregnancy by measuring hCG in the urine, you have to read the instructions for the test kit because instructions for usage are different for different test kits. 

An indicator will show if you are pregnant. For example, some kits will show two bold lines if positive (Figure 6.2) and one bold line if negative (Figure 6.3). These indicators are different for various kits.​

​How Accurate are the Pregnancy Test Kits? 

Pregnancy tests are rarely wrong. It is more than 99% accurate. Thus, if your test is negative, it means that you are not pregnant; However, if you are very early in your pregnancy and the test is done too early, there could be insufficient amount of hCG in the urine for the test to detect. 

So, if a test comes back negative but you strongly suspect that you are pregnant, repeat the test in a few days’ time. 

There are rare examples when the hCG level is raised transiently and then drops to zero. This is known as “biochemical pregnancy” and could be the cause of a false positive result of the test kit. This initial rise of hCG levels would soon drop in “biochemical pregnancy” and result in a negative test result. Vaginal bleeding occurs soon after, which would coincide with “delayed menses”. Also rarely, there could be occasional ovarian tumors which secrete hCG and the false positive result could be wrongly interpreted as a pregnancy.​ 

​​​Frequently Asked Questions

1. Do I have to test with first morning urine? 

Although you can test any time of the day, your first morning urine specimen is usually the most concentrated of the day and would have the most pregnancy hormones in it. 

2. When should I take the test if I suspect that I am pregnant? 

You can test your urine as early as six days past ovulation but the first day of your missed period is recommended for greatest accuracy. 

3. Do I need a blood test for hCG to confirm my pregnancy? 

Blood tests for hCG are more accurate in detecting HCG and they can also measure the actual levels of the hormone. These tests may be useful to differentiate a miscarriage when the blood hCG will drop with time or a healthy pregnancy when the blood hCG level will double every two days. Occasionally, we need to follow-up the hCG levels to help us diagnose an early ectopic pregnancy (pregnancy that is ​outside the womb), which could be potentially life-threatening or confirm a miscarriage.

Acknowledgement

Source: Dr TAN Thiam Chye, Dr TAN Kim Teng, Dr TAN Heng Hao, Dr TEE Chee Seng John, The New Art and Science of Pregnancy and Childbirth, World Scientific 2008.

Visit Parent Hub, for more useful tips and guides for a healthy pregnancy.

Download the HealthHub app on Google Play or Apple Store to access more health and wellness advice at your fingertips.

Ever wonder if a dollar store pregnancy test is reliable? We got a family doctor to answers every question you’ve ever had about pregnancy test accuracy.

You’ve opened the box, ripped open the plastic, peed on the absorbent strip and impatiently awaited your results. But have you ever wondered just how much you can trust that little stick? With so many brands and styles on the market—from fancy early detection models to cheap ones you can pick up for next to nothing at the dollar store—choosing the right pregnancy test can feel overwhelming. Carrie Schram, a family doctor at Women’s College Hospital and medical director of the cycle monitoring program at Hannam Fertility Centre in Toronto, answers everything you’ve ever wondered about pregnancy test accuracy, the importance of price and how to avoid a false negative.

How do pregnancy tests work?

Any pregnancy test you can find, regardless of brand, style or price, will look for one simple thing: a detectable level of human chorionic gonadotropin (hCG), the hormone that is produced by a newly implanted embryo. In a typical pregnancy, the hormone level doubles every 48 to 72 hours and usually reaches a level that can be detected by a urine test around 12 to 14 days after conception (or a couple of days before your expected period). If a test is more sensitive, it may be able to detect lower levels of hCG (that is, an earlier test result).

How likely is it to get a false negative?

If your pregnancy is in its early stages and your body has not yet produced enough hCG for the test to detect, you could get a false negative, which means you’re actually pregnant, even though the test says you’re not. The earlier you test, the higher the chances that this scenario will occur. If you get a false negative but still suspect that you’re pregnant, repeat the test in a few days. If you miss your period, test again and book an appointment with your healthcare provider if you still get a negative result. “It’s reasonable to visit your doctor for more-definitive blood work and see if there is another reason why you haven’t had a period,” says Schram.

What about a false positive?

A false positive—when a pregnancy test says you’re pregnant but you aren’t—is much rarer, but it can occur. The medication Ovidrel (choriogonadotropin alfa), which is a form of the hormone hCG that is used in fertility treatments, can be detected by a pregnancy test up to 12 days after it’s injected. If you have a tumour that secretes hCG, your pregnancy test could also show a false positive, but this is very rare. In addition, pregnancy tests can pick up on pregnancies that can’t be carried to term, such as ectopic pregnancies (most often in the fallopian tubes) and very early miscarriages.

Does the day I take the test affect pregnancy test accuracy?

The earlier you test, the more likely you will get a false negative. “Implantation usually occurs about nine days after ovulation, and periods usually start about 14 days after ovulation,” says Schram. That means that if you test too soon before your expected period, you will get a negative test result, even if you are pregnant. From a results perspective, the best time to test is the day of your expected period or afterwards.

Do tests that promise early detection actually work?

Some specialty tests are able to detect a pregnancy as early as six days before a missed period (which, FYI, is not the day your period is expected but the day after). “But the earlier you test, the less accurate the test will be because ovulation isn’t perfectly consistent from month to month and implantation can vary by two or three days post-ovulation,” she says. “I have seen patients get quite upset when an early test is negative, only to find totally appropriate hCG levels present the day their period is due.”

I have irregular periods. When should I test to ensure accuracy?

If your periods are irregular and vary by more than a couple of days each month, it will be harder to know when to test for pregnancy, but results from ovulation tracking can act as a guide. If your urinary ovulation monitor, which detects luteinizing hormone (LH)—the hormone that triggers ovulation—gets a positive result, you can test for pregnancy about 10 to 14 days afterwards. (Note: This method won’t work if you tend to get false-positive urinary LH readings.) The same is true if you track your temperature and notice the subtle rise that occurs after ovulation. Simply wait 10 to 14 days before taking a pregnancy test. “If you don’t want to track ovulation or find it difficult, test for pregnancy once a week,” says Schram.

Is price a factor when it comes to pregnancy test accuracy?

Pregnancy test accuracy is not affected by price. If your dollar store pregnancy test says you’re pregnant, you almost certainly are. That said, more expensive tests may have increased sensitivity, so they’ll be able to detect lower levels of hCG and provide positive test results at an earlier date than cheaper tests. “That’s why you shouldn’t rely on dollar store tests to test really early,” says Schram.

Should I use the accuracy percentage on the package to choose my test?

Any test you find at a Canadian drugstore, grocery store or dollar store will have more than 99 percent accuracy if you test on the day of your expected period or afterwards. More-expensive early detection tests may include a table with accuracy percentages for up to six days before a missed period, and you’ll notice that accuracy decreases the earlier you try to test. (For example, the Clearblue Early Detection Pregnancy Test claims more than 99 percent accuracy if you test the day of your expected period or one, two or three days before; 96 percent accuracy four days before; and 79 percent five days before. These numbers are comparable to the First Response Early Result Pregnancy Test.)

Should I rely on detectable hCG levels to choose my test?

One of the most valuable pieces of information you can have is the hCG level that the test can detect. The lower the amount of hCG required, the more sensitive the test and the earlier you’ll be able to confirm a pregnancy. Unfortunately, this information can be hard to come by. Clearblue is transparent and posts these levels on its website. Other brands list them on the directions inside their packages (so you won’t know the detectable hCG level unless you buy a test). Other brands refuse to give out this information at all.

Here are the detectable hCG levels found in some of the most common pregnancy tests in Canada. They’re almost all the same, regardless of price or promised “early result.” Remember, the lower the number, the more sensitive the test.

Clearblue Early Detection Pregnancy Test: 10mIU/mL

Clearblue Pregnancy Test with Weeks Indicator: 25mIU/mL

Clearblue Rapid Detection Pregnancy Test: 25mIU/mL

Life Brand One Step Pregnancy Test (house brand of Shoppers Drug Mart): 25mIU/mL

Life Brand Early Result Pregnancy Test (house brand of Shoppers Drug Mart): 25mIU/mL

Medi Care One Step Pregnancy Test (sold at Dollarama): 25mIU/mL

Equate One Step Pregnancy Test (house brand of Walmart): 25mIU/mL

Is it faster or more accurate to go straight to the doctor to get tested?

“For most women, it’s actually faster to grab a test from a pharmacy or dollar store,” says Schram. “The first step with us is also a urine test, which tests hCG at the same concentrations as the test you use at home. Plus, most offices don’t stock fancy early detection tests, so ours may actually miss very early pregnancies that you could pick up at home. When medically indicated, we can also order serum (blood) pregnancy tests, but these can take up to 24 hours to come back.”

3 tips to ensure that your results are as accurate as possible

1. Check the expiry date: Using an expired test could result in a false negative.

2. Take the test first thing in the morning: All pregnancy tests check hormone levels in urine. Taking the test after you’ve had a lot of water or fluids will dilute your urine, increasing the chances of a false negative test, especially for an early pregnancy. It’s best to take the test after you’ve gone several hours without drinking.

3. Follow the directions: Since instructions vary by brand, make sure that you take a quick read. For example, a package might say that you should check your results within 10 minutes, so follow suit. “Leaving the test out too long can lead to a ‘ghost line,’ which appears when other substances in your urine deposit on the detection line as the urine evaporates,” says Schram. The false line will affect the accuracy of your reading.

The takeaway? Pregnancy test accuracy is high, and at-home tests, regardless of style or price, are excellent at detection when there is enough hCG in your urine—usually 12 to 14 days after conception. If your test result is positive, you are almost certainly pregnant. But if your test result is negative, the pregnancy may be too early to be detected. Simply test again if you miss your period.

Can you get a negative pregnancy test 6 days before period?

How accurate is a pregnancy test 6 days before period?

Can you get a false negative 5 days before period?