Hello, i have been experiencing abdominal pain on my right side, and recently had a heavy, black period, about a week before it was scheduled. is there something wrong? also not sexually active, with no history of disease or surgery.

Endometriosis: The symptoms you're experiencing sounds like endometriosis. A disorder in which tissue that normally lines the uterus grows outside the uterus. The most common symptoms are pain and menstrual irregularities. Effective treatments, such as hormones and excision surgery, are available. OTC ibuprofen or naproxen can alleviate pain. Please refer to your GYN for follow up.