When you’re actively trying to get pregnant, those two weeks between ovulation and a positive home pregnancy test (or your period) can seem much longer. If you’re like most women, you’ll spend them hyper-aware of every ache, twinge and craving your body has, wondering whether it’s an early sign of pregnancy. Show One of the most telltale symptoms of pregnancy is bleeding. If you do have some light spotting, does it mean anything? While it can be hard to tell, many women who go on to have healthy, normal pregnancies have what’s called implantation bleeding around the time that their embryo lodges itself into the side of the uterus. What is implantation bleeding?Implantation bleeding is light bleeding or spotting that occurs between seven and 14 days after fertilization. After ovulation and at the moment an egg is successfully fertilized by a sperm in a fallopian tube, the embryo starts dividing and growing. At this time, the inner lining of the uterus, called the endometrium, starts to change. It's already been thickening throughout the menstrual cycle, but it’ll need to grow and mature even more to protect and nourish an embryo. Around five to six days after fertilization, the quickly growing embryo has moved down the fallopian tube and into the uterus. It’s starting to need more nutrients, and the endometrium has filled in enough to support it. Next, the embryo attaches itself to the endometrium, where it becomes reliant on a mother’s body — for the first time — for nutrients and oxygen. When the embryo implants, it can disrupt tiny blood vessels in the spot it burrows into. This won’t cause any problems (the endometrium recovers!) but some women will experience light bleeding, from pinkish or red to brown discharge. When does implantation bleeding happen?So-called implantation bleeding will likely arrive earlier than your expected monthly menstrual period, usually around seven to 10 days after fertilization or conception. Continue Reading Below Read This NextSigns of implantation bleedingThese are some of the most common implantation bleeding symptoms:
Implantation bleeding vs. period bleeding: How to tell the differenceSince implantation bleeding is a symptom that can often occur before you test positive on a pregnancy test, it can be hard to know whether light bleeding is an early sign of pregnancy or just normal spotting leading up to your period. And unfortunately, there’s no conclusive way to find out. The best way to know whether you’re pregnant or not is to wait a few more days and take a pregnancy test. The timing of when you last had sex might also help you figure it out. If it’s been more than two weeks, it’s unlikely that any spotting you're having is implantation bleeding. About a third of women who report having experienced implantation bleeding often describe it as distinct from their usual premenstrual spotting — some say the blood is darker and not as red compared with normal period blood. Others have mild cramping at the same time as the spotting. But for many women, the two types of bleeding aren’t different at all. So you’re not alone if you assume that some spotting is implantation bleeding and get your period a few days later, or if you assume that implantation bleeding is normal spotting and end up being pregnant! How long does implantation bleeding last?Implantation bleeding usually only lasts one or two days. When to call the doctorLight bleeding during pregnancy — even at times other than implantation — is often normal. Causes can include mundane things like irritation of the cervix following a pelvic exam, sex or infection of the vagina. But because bleeding following a positive pregnancy test can sometimes be a sign of ectopic pregnancy, molar pregnancy or other early miscarriage, you should always call your medical provider if you experience it so you can talk through any other symptoms. Try not to worry too much though. Chances are good that if the bleeding is light and doesn't last long, everything is fine. From the What to Expect editorial team and Heidi Murkoff, author of What to Expect When You're Expecting. What to Expect follows strict reporting guidelines and uses only credible sources, such as peer-reviewed studies, academic research institutions and highly respected health organizations. Learn how we keep our content accurate and up-to-date by reading our medical review and editorial policy. Was this article helpful? Answer From Mary Marnach, M.D. Implantation bleeding is defined as a small amount of light spotting or bleeding. It typically occurs about 10 to 14 days after conception. Implantation bleeding is common, and it usually isn't a sign of a problem. Implantation bleeding is thought to happen when the fertilized egg attaches to the lining of the uterus. Implantation bleeding usually occurs around the time you would expect to have a menstrual period. However, implantation bleeding is lighter than menstrual bleeding. Some people don't experience implantation bleeding and others don't notice it. Sometimes, implantation bleeding is mistaken for a light period. If this happens, you might not realize that you're pregnant. This can lead to mistakes when determining a baby's due date. A fetal ultrasound — typically done during the first trimester of pregnancy — can help accurately determine the baby's due date. Implantation bleeding is light, stops on its own and doesn't require treatment. If you're concerned about any vaginal bleeding during pregnancy, contact your health care provider. Sign up for free, and stay up to date on research advancements, health tips
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