If there is a history of normal sexual intercourse and you do not have a period on the date of your period but you have stomach pain, you must clinically rule out the possibility of ectopic pregnancy. You can go to the hospital to have a blood test for blood HCG to find out if you are pregnant. If pregnancy is indicated, it is recommended that blood be drawn every other day to find out if the blood HCG appears to have doubled. If it does not, ectopic pregnancy is highly suspected clinically and requires hospitalization for appropriate treatment. In case of menopause and stomach pain without pregnancy, ultrasound is recommended to check if there is any abnormality in the uterine adnexa. If the uterine appendages are normal, you can take progesterone orally to promote menstruation, once a day, 2 capsules once, for 3 days, and your period will come 3-7 days after you stop taking the medicine, and it is also recommended to drink brown sugar and ginger water, which has the effect of dispelling cold and warming the uterus, and can relieve stomach pain.