Finding out that you are pregnant after having your period can be due to mistaking vaginal bleeding for menstruation. Early pregnancy causes vaginal bleeding for more reasons, such as miscarriage, ectopic pregnancy, etc., but this bleeding is not menstruation. 1. Miscarriage: mainly manifested as vaginal bleeding after menopause, according to the closure of the cervix and the presence or absence of pregnancy discharge, it can be categorized into different types of miscarriage, such as preeclampsia, inevitable miscarriage, incomplete miscarriage, complete miscarriage and so on, preeclampsia bleeding is less. 2. Ectopic pregnancy: commonly known as “ectopic pregnancy”, the most common in tubal pregnancy, manifested as postmenopausal vaginal bleeding, abdominal pain, etc., according to the location of the fertilized ovum, bleeding time, symptoms, etc., there are different manifestations, generally not much vaginal bleeding, a few can be similar to the amount of menstruation. For women of childbearing age, if vaginal bleeding is indistinguishable from menstruation, a human chorionic gonadotropin test can be performed.