Understanding New and Severe Abdominal Pain

Since you are having pain and a delay in your menses, it is possible that you have the dangerous problem of an ectopic pregnancy (tubal pregnancy)! You must be tested for pregnancy immediately, and you should be evaluated by a doctor!

If you are not pregnant, it is also possible that your pain is coming from an ovarian cyst. Because a cyst in the ovary can create a shift in your hormone levels, it may affect the timing of your menses.