Ovulation does not occur during pregnancy. During each menstrual cycle, follicles are stimulated by estrogen to mature and then shed. Progesterone is the main hormone in the body during pregnancy, and estrogen is suppressed, so ovulation does not occur, and the secretion of progesterone continues until the end of breastfeeding, and most women do not ovulate during breastfeeding. During the first and second trimesters of pregnancy, it is important to prohibit sexual intercourse, which can lead to miscarriage in the first trimester and premature birth in the second trimester. Therefore, although she will not ovulate, in order to ensure the healthy growth of the fetus in her belly, pregnant women should lead a regular life, keep a happy mood, eat more fruits, vegetables, lean meat and eggs, and not be partial or picky about food, so that the fetus can grow healthily. When the hormone level of the body returns to normal after delivery and the ovaries secrete more estrogen, ovulation will resume and the menstrual cycle will also resume.