Possibly pregnant, what do I do about the father?

I think I'm pregnant. I've missed my period, i've got all the symptoms, and I'm taking a pregnancy test Tuesday morning to confirm it. The father already knows what's going on, to a slight extent of the little he's allowed me to tell him... which was, "My period is late, and I'm taking a test soon to confirm it. Don't worry, don't panic. i'll give you an update when I know more" after his first statement of that he was kind of scared, he hasn't really talked to me. We're not dating, but we are really close friends, and we slept togeather a couple of times. We talked about what we would do a few weeks ago if I did get pregnant, and he said we'd raise the baby togeather. Then yesterday I tol d him that there's a chance I'm pregnant, and he just kinda stopped talking to me. he said he's busy, he was at the gym, or studying for calc. but I feel like we need to talk about this. Should I try and get him to talk to me, or just let him totally block me out? oh, btw, I'm 17.