Implantation Bleeding Before Pregnancy: Your TTC Tutorial

When you're trying to get pregnant, every one of your senses is on high alert for any nuance that you're officially a mom-to-be! So, if you see spotting, is it a sign of pregnancy implantation bleeding? And just when does implantation bleeding happen anyhow?

Here's everything you should know about implantation bleeding:

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In a nutshell: Implantation is spotting—light vaginal bleeding—that can occur when the fertilized egg implants in the lining of the uterus.

"This bleeding occurs 10 to 14 days after fertilization," says Lauren Barlog, M.D., assistant professor in the Department of Obstetrics, Gynecology and Women's Health at Rutgers NJ Medical School. "It typically occurs around the time of your next expected period."

Sometimes it's so minor that you don't even notice it—or you may think it's a super-light period. Typically, it's minimal bleeding or spotting for a day or two.

Nope. Some women will, some won't. And it doesn't mean implantation didn't occur if you don't notice it.

"Women wonder if it's good to see implantation bleeding or do you hope you never see it?" says Zev Williams, M.D., Ph.D., chief of the Division of Reproductive Endocrinology and Infertility at Columbia University Medical Center. "But it's actually a diagnosis given after the fact." That means if you do see spotting, you probably won't even realize what it is (or, more accurately, what it was!) until a pregnancy test comes up positive later on.

RELATED: Bleeding During Pregnancy: What's Normal, What's Not

You know what's a 'normal' period for you. If this seems 'different' or if you've been attempting to get pregnant and this is light, spotty, and lasts only a day or so, it may not be your period. But only time will tell! What to do? Wait a week after spotting, then take a pregnancy test, says Dr. Barlog.

RELATED: Implantation Bleeding vs. Your Period: How to Tell the Difference

"If you are spotting but also have pain that's concentrated on one side, rectal pain, or a history of infertility or tubal disease, you should see a doctor immediately," says James Segars, Jr., M.D., director of Reproductive Science and Women's Health Research, and a professor of gynecology and obstetrics at Johns Hopkins Medicine. "These are signs that you could have a tubal or ectopic pregnancy, when the fertilized egg implants somewhere other than the uterus, usually within the fallopian tubes."

And you also should see your doctor if you've had bleeding or spotting between periods for several months because you may be dealing with other conditions such as fibroids or polyps.

While every test has a different threshold for sensitivity, the absolute earliest you should take one is about four or five days before your next expected period, says Dr. Williams. If it's negative, repeat it in a few days.

RELATED: When to Take a Pregnancy Test

If you already know you're pregnant and notice some spotting, you may be experiencing what's called "first trimester bleeding." About 15 to 25 percent of women experience light bleeding or spotting during the first few months of pregnancy. It's usually not a cause for worry but should be monitored.

"In general, any bleeding during early pregnancy is common but not normal, and you should call your doctor," says Dr. Barlog. The good news is that in most cases with early bleeding, you'll go on to have a healthy pregnancy.