I am 20 yrs old and am having problems that I cant seem to figure out.My last menstration cycle ended on Feb.28/09 and when I counted the days for my next period I counted for March 28/09.2 weeks after my cycle ended on the 28th of Feb I started to notice some darkish red/brownish spotting.I was spotting from March 12 to about the 19th and it has been flucuating from brownish to light red.Then from about the 20th it has been a bit heavier light red bleeding.After I came back on the 22nd from swimming my tampon was full of blood.The next day it went back to light bleeding then now again it is a little heavier.I went to see a doctor on the 23rd and when they took a pregnancy test it came out negative.She gave me some birth control pills to take because I am having a hormone problem according to her.It is now March 25th and the bleeding still has not stopped.I have only had light/barley there cramps the last few days.I did have unprotected sex with my bf just after my last cycle and I am not on birth control...I was wondering if this is a serious problem or could it be possible that I am pregnant?? This has never happened to me before and I am somewhat worried can someone please help me? :'(