The medications that women take prior to pregnancy can affect the development and quality of follicles and the formation and implantation of fertilized eggs. The main reason for the adverse effects on pregnancy is that the follicles are not of good quality and do not ovulate properly, resulting in a normal pregnancy or that the fertilized egg is of abnormal quality and does not settle and develop properly, resulting in miscarriage and abortion in early pregnancy. If the medication is taken before pregnancy and there is no early miscarriage or embryonic abortion during the development of the embryo, then there will be no adverse effects on the development of the fetus in the future. In the early stage of pregnancy, especially around the 3rd to 8th week after intercourse during ovulation, is a critical period for the development of all systems of the embryo, and also the period with the highest incidence of fetal malformations, so you should avoid taking any drugs during this period.