If it is a normal menstrual period, you definitely can’t be pregnant. Menstruation is mainly a peeling bleeding of the endometrium that occurs when hormone levels drop before menstruation and the endometrium loses the support of high hormone levels, so it is not possible to get pregnant. However, there is a special case, that is, the patient has vaginal bleeding, which may be mistaken for menstruation, but is not really menstruation, but rather vaginal bleeding due to an abnormal pregnancy, such as a miscarriage with first trimester or ectopic pregnancy. This type of bleeding is usually small in amount, and the patient may bleed for a longer or shorter period of time, often accompanied by abdominal discomfort or pain on one side of the abdomen. The patient needs to be examined by blood chorionic gonadotropin, blood progesterone or ultrasound to make a comprehensive judgment. If the pregnancy is intrauterine, the patient should be kept pregnant. If the pregnancy is ectopic, conservative treatment or surgery will be needed depending on the situation.