In a sexually mature woman, only one mature egg will be expelled each month, and the hormone levels in the body will change dramatically if she becomes pregnant. The levels of estrogen and progesterone, especially progesterone, increase dramatically, thus inhibiting the development and discharge of follicles in the ovaries, so that no new follicles develop or are discharged after a woman becomes pregnant. After pregnancy, the progesterone secreted by the fetus will take the lead and suppress the secretion of estrogen and luteinizing hormone, so the follicles in the ovaries will no longer develop because they are not mature and will not be discharged from the ovaries, so women will not ovulate throughout pregnancy. In addition, the progesterone secretion in the body continues until the end of the breastfeeding period, so most women do not ovulate during the breastfeeding period. When a woman is first pregnant, she may experience symptoms similar to ovulation due to the increase in progesterone, such as increased discharge, increased libido, and stretched leucorrhea. However, these symptoms are not caused by ovulation, but by pregnancy. You can go to the hospital to have a blood test to determine if you are pregnant. Since a woman does not ovulate during her entire pregnancy, she will not become pregnant again even if she has sex during pregnancy.