1. Will menstruation occur after pregnancy? After pregnancy, a woman\’s body will undergo many changes, one of which is the cessation of menstruation. Therefore, after becoming pregnant, a woman will no longer have her period. 2. Why don’t menstruation occur after pregnancy? The reason why menstruation does not occur after pregnancy is because the woman\’s egg has been fertilized, implanted inside and started to grow and develop. At this time, the endometrium has formed a complete layered structure and provides nutrients and protection to the fetus. If fertilization does not occur or the fertilized egg fails to implant successfully, the lining is excreted during the next cycle to form menstruation. 3. Is there any bleeding during pregnancy?