A delayed period with lower abdominal pain can be a sign of pregnancy, and there may be irregular periods. If you are a married woman, you can go to the drugstore and buy early pregnancy test strips and have your urine tested or go to the hospital for a blood HCG test. If these two results are positive, it will prove that you are pregnant. If pregnancy has been ruled out, you can use medication to adjust your menstrual cycle under the guidance of your doctor, such as progesterone capsules, and you can stop taking progesterone capsules after 5-7 days, and you will have your period within 3-5 days after you stop taking them. We don’t need to be overly nervous about occasional irregular periods, but if you have irregular periods for several months in a row, it’s best to go to the hospital for a relevant examination, such as a gynecological ultrasound or a relevant blood test.