The pain in the stomach, like menstrual cramps, may be caused by the fertilized egg coming to bed. After pregnancy, due to the increased secretion of reproductive hormones in the body and the gradual enlargement of the uterus, coupled with the fact that some women have a weaker constitution, it is indeed possible that menstrual cramps similar to those experienced during menstruation may occur. However, as long as this condition is not serious, there is usually no need to worry about it. After rest, it will gradually ease as the fetus grows. However, if the pain continues to worsen, or even if vaginal bleeding occurs, along with a feeling of anal swelling, you need to go to the hospital for a checkup, mainly to see if there is an ectopic pregnancy and to rule out the possibility of ruptured ectopic pregnancy. If you have such pain during pregnancy, you should not apply pain medication as it may affect the development of the gestational sac, and if there is a problem that requires medication, it must be used under the guidance of a doctor.