It is also possible to get pregnant while breastfeeding without a period. Generally speaking, the endometrium of the uterus will gradually return to normal around 42 days after delivery and normal menstrual flow and ovulation will resume. However, if you need to breastfeed after giving birth, due to the high level of prolactin during breastfeeding, it will affect the recovery of menstruation and the recovery of ovulation, and some women who do not get pregnant during breastfeeding think that they will not get pregnant during this period. However, there are some women who do not have menstruation during breastfeeding and will ovulate normally, so if they do not take proper contraceptive measures during intercourse, they may still get pregnant. Women should always use contraception when having sex while breastfeeding. If they do not use contraception, they can take a contraceptive stick test one month after having sex, or go to the hospital for a checkup if necessary.