Can i get pregnant a day before having my period? answers please?

hey guys, me and my boyfriend had unprotected sex (yes he released inside me) on Thursday 2/10/11 then the following Saturday 2/12/11 i had my period and yes it was regular period. can i still get pregnant? and how soon i can take a pregnancy test? im asking because my breast, nipples and stomach hurts after my period was over. I always have a regular period too.>>> TODAY 2/20/11 SUNDAY 8:00PM I WAS FEELING NAUSEOUS THE WHOLE DAY I DK IF IT WAS SOMETHING I HAD EATEN OR MY DRINKING FROM LAST NIGHT UMMM.... YES I JUST VOMIT IT WAS GAGS AND LIGHTLY VOMIT 3 TIMES NOW I'M WORRIED! GOOD ANSWERS PLEASE!!! SHOULD I TAKE A HPT??????