boobs hurts, fell sick to my stomach but never throw up.

Can I be pregnant & still bleed?
I had a period November 3-8 of 2011.... i was two week late &started blerding December on the 15- 19 of 2011my boy friend and i had sex... i was craping a little. The next day I started bleeding and it was kinda like a period. It lasted 5 days. Im normally regular.. i don't know if this was my period or em i just bleeding because of sex?? Ive felt sick to my stoach two times since the bleeding due to smell but i didnt throw up. Today i sleeped 24 hours... eitch ive NEVER done.. I have been pregnant before but it seems a little different. Can someone please help me? Im also having little brown discharge.. slong with white.