Could I be pregnant?

Hi, guys. So last Friday I think I officially lost my virginity, and we did it without a condom. I don't think he came, but there is a possibility. I was pretty intoxicated. I know that protection is everything, and it was a stupid act, but it's don't and now I need advice. I'm getting on the pill soon hopefully. 
So back to what happened..we did the deed and we stayed in bed from Friday night til Saturday morning & just continued to hang out til Saturday afternoon. When we did it he didn't get his entire penis in me, but there was definite thrusting. I've been feeling weird pains and movement in my stomach. <a href="">Eve</a> says my fertile window isn't open until tomorrow. Do you think I could be pregnant? 
I appreciate all replies and help. I'm trying not to freak out.