I have never been regular, but I've never had a period last this long before. I hadn't had a period for four months. My period started out of no where and it's been lasting for three weeks now. I'm really worried. What could be wrong? If I go to the doctor will I have to be examined or be put on birth control or both?? I feel really uncomfortable about going to the doctor, but I wanna know what's wrong and what they'll do. Please help!!!!