Could i be pregnant??????????

I had unprotected last month on 4/1/ 11. I was soppose to get my period on da twenty somethin bt instead on april 14 brown discharge startin comingout. And white mioucus wit brown (sorry to much info) it wasnt a normal period. What does this mean? And also. I been feeling nacious on the morning, no throwin up thoe. An i been feeling moody. Help need serious answers pls!!!!