I had sex (rough and deeper penetration than I m used to) for the first time in two years two weeks ago. 5 days later, I began bleeding heavily and having menstrual cramps more uncomfortable than normal. It s now going on 9 days later and I m still bleeding on and off, but not enough to use a tampon. I still have lower back cramping. I just started birth control and this is my 3rd month, didn t have much of a period the last two months. My regular period per my birth control should have started two days ago. Should I see a doctor?