The presence of a small amount of bleeding before menstruation does not necessarily mean that pregnancy is present, as there are other factors that can cause it, for example, when there is luteal insufficiency, the lack of progesterone release in the body can cause a small amount of bleeding before menstruation. For example, when there are gynecological diseases, uneven endometrial echogenicity, cervical canal polyps, endometrial polyps, submucosal fibroids, and adnexal cysts, they may cause a small amount of bleeding before menstruation. However, there are some women who do experience a small amount of bleeding at the time of implantation. It is not possible to determine whether or not a woman is pregnant by a small amount of bleeding, but an auxiliary test is needed to make an accurate determination. It is recommended to buy a pregnancy test about 12 days after intercourse to rule out the possibility of conception, and if not, go to the hospital for a checkup in time.