If you take progesterone and don’t get your period, and your stomach hurts, and if you don’t get your period for more than 10 days, you need to have an ultrasound to find out the condition of the uterine lining, as well as a blood test for HCG to rule out the possibility of pregnancy. Generally speaking, if you take progesterone, you will have your period within 10 days, and the pain in your stomach is probably a symptom of pre-menstrual period. If you still don’t have your period in a week, you should go to the hospital and have an ultrasound to check the condition of your uterine lining. At the same time, you need to take a blood test for HCG to rule out the possibility of pregnancy, because the uterine lining is too thin and pregnancy, etc. will not come to menstruation even if you take progesterone. It is recommended that women who normally have regular menstrual periods but have not had a period for more than a week should have blood tests for HCG to rule out pregnancy, ultrasound to check the condition of the uterine lining, and follow up with the doctor if they have abdominal pain, vaginal bleeding, and other discomforts.