Two weeks ago, I had sex and then started bleeding afterwards, period-blood. For two weeks, on and off I've been bleeding, sometimes it's spotty, sometimes it's brown, and sometimes it comes out kinda chunky in the toliet. I took a pregnancy test yesterday and it came out negative so I really have no idea what's going on. I've been told it could be due to stress and weight flux, and as I just got back to college that sounds reasonable, as well as living with another girl, and my roomate is on a slightly different cycle than me. I just want to stop bleeding. Any ideas on what it could be and what to do? I was told to make a gyno appointment if it doesn't go away in a week but I really want it to be gone NOW.