Pregnancy after taking ovulation stimulating drugs once means that the ovaries are functioning relatively well. Pregnancy in this case can lead to a baby and does not affect fetal development because of the ovulation-promoting drugs. Normal ovulation cycle requires normal function of the hypothalamic-pituitary-ovarian axis. Dysfunction of any one of these parts can lead to non-ovulation, which can cause absence of menstruation, scanty menstruation, dysfunctional uterine bleeding, etc., and consequently infertility. Ovulation-promoting drugs are mainly used to treat anovulation due to dysfunction of the hypothalamic-pituitary-ovarian axis, in which case ovulation can be induced by taking the drugs. However, the causes of ovulation disorders are complex and different drugs should be chosen according to medical advice. Commonly used ovulation-promoting drugs include clomiphene, letrozole, human chorionic gonadotropin and others. In addition, ovulation promotion drugs are hormonal and have significant side effects, which can cause ovarian cysts and ovarian hyperstimulation syndrome. It is important to take the medication under the guidance of a professional doctor. Before using the medication, couples should also do a good preconception checkup with ultrasound to monitor the follicles and endometrium, and the medication should not be used continuously for more than six months. In addition, after pregnancy, avoid contact with harmful substances, such as dyed nails, dyed hair, etc., which can easily cause malformation or miscarriage; reduce radiation to the body, such as playing less cell phones, computers, etc.; maintain a regular life, such as avoiding staying up late, overeating, avoiding strenuous exercise; should be on time for maternity check-ups, such as 12 weeks of pregnancy to build a card, 20-25 weeks for a teratology examination, etc.