When you’re pregnant, vaginal bleeding can be alarming, but it’s important to know the differences between implantation bleeding and your period. According to Mayo Clinic (1), implantation bleeding is defined as a small amount of light spotting or bleeding. It typically occurs about 10 to 14 days after conception.
Because implantation bleeding usually occurs around the time you would expect to have your period, it can easily be mistaken as a light period. However, implantation bleeding is typically a much shorter duration and the color is often pinkish/brownish versus red.
If implantation bleeding is mistaken for a light period, you might not realize that you’re pregnant. Some women have it, and others don’t! Scheduling an ultrasound during the first trimester of pregnancy can help accurately determine the gestational age and due date. If you are experiencing light implantation bleeding it stops on its own and does not require treatment. However, if you are concerned about any vaginal bleeding during pregnancy, contact your doctor.
Source (1): https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/expert-answers/implantation-bleeding/faq-20058257