pregnant?

Okay, so I had sex last friday night he wore a condom and pulled out per usual, but when he pulled the condom off some semen got in my inner thigh. I got my period Monday But not as heavy as normal, I just got home today (Thursday) and felt the need to throw up I'm not sure if I've ate to much or if it could possibly be morning sickness (even though I didn't think you could get it that early) if it got on my lower thigh is there any way could I be pregnant?