What is the cause of an unreguler period?

Hormones: A doctor can check to see if there is a medical issue, if a woman has mild menstrual-related symptoms. Many women have some variation of mucus discharge, of periods, or a missed period on occasion. Some women feel normal after a few days, but others have bothersome symptoms and follow-up with a doctor. A urine pregnancy test can be done 3-4 weeks after sex, if one is sexually active.