Whether uterine fibroids have an effect on pregnancy is related to the growth site and size of fibroids. The details are as follows: 1) mucosal layer leiomyoma: the leiomyoma grows in the uterine cavity, which affects the fertilized egg and leads to early miscarriage; 2) myofibroid: the leiomyoma bulges into the uterine cavity, which affects the embryonic development and leads to miscarriage or even embryonic abortion; 3) subplasmalemma leiomyoma: it usually has little effect on pregnancy, but the leiomyoma can increase in size during pregnancy, and progesterone has a mitogenic effect on the leiomyoma, which should be closely monitored. It is recommended that women undergo routine gynecological examination before pregnancy. Find out the size of the myoma, whether it affects pregnancy, and decide on further treatment options.