I last had sex 1st/2nd week of November. I've only had one partner. We had unprotected sex once over a year ago. I don't count the days in my cycle, sometimes I would have really bad cramps, but other than that I think my cycle seemed pretty normal. This past year there were a couple of times that I would get dark brown/red gooey discharge, usually it's clear or milky. My last period ended around the end of May. Around June 10th I started getting blackish red gooey discharge and headaches. On June 19 I started getting brown spotting that lasted throughout the day and a little the next day.  It stopped on June 21st. On June 26 I started getting minor vaginal pain, and sometimes a pain on the left side near my belly button. Does anyone know what this could be? Is it serious enough to go to the doctor? I just turned 20 and I really don't feel comfortable asking my mother about this kind of stuff, but if I do go to the doctor does it have to be a gynaecologist, or can I  book an appointment with my GP?