If your period is delayed and you have abdominal pain, and you have had sex before, you are more likely to be pregnant. Early pregnancy is due to embryo implantation and the enlargement of the uterus will appear abdominal pain, need to confirm the diagnosis by doing a pregnancy test. Secondly, if you have a history of hysteroscopic operation in recent months and you do not have menstruation but have abdominal pain, you need to exclude hysteroscopic adhesions and cervical adhesions, which are caused by endometrial damage and poor recovery of the endometrium, and the biggest effect will be the reduction of menstruation or absence of menstruation. Third, gynecological inflammation can also lead to delayed menstruation and abdominal pain, such as pelvic inflammatory disease and ovarian cysts.