HELP ME!

Okay first of all i am on the contraceptive pill ,my boyfriend has been away for a month or so, so i havent been sexually active, had my period last week and all that. This week I have had end of year exams and have been really stressed out. I came down with a cold on tuesdayish and threw up on wednesday night, since then I havent had much of an appetite because i feel sick if i eat. Im starting to feel better now but the question is DO YOU THINK IM PREGNANT?