If the cyst is small, it may be a physiological cyst, because after pregnancy, with the increase of estrogen and progesterone in the body, the ovaries are stimulated and cause ovarian cysts, and the cysts can disappear automatically around 12 weeks of pregnancy without treatment. If the cyst appears before pregnancy, and after pregnancy, with the prolongation of pregnancy, the cyst will keep increasing and affect the fetal development by pressing on the fetus, it is recommended to undergo surgery around the third month of pregnancy. Cysts generally belong to benign tumors, which do not affect the body much, but a few of them can become malignant. If a malignant tumor grows during pregnancy, timely surgery is needed to avoid untimely treatment that can easily cause metastasis, and abortion is also needed during surgery, because malignant tumors need to use chemotherapy drugs after surgery, so they have a great impact on the fetus.