Kind of worried...

Okay so my man and I had sex on Jan 31. So it's been one week exactly. He didn't have a condom so we both agreed on the pullout technique. When I was on top of him he asked me to get off because he was "gonna cum" but I don't know if he came inside me or not. I asked him and he said no but I don't know if he was just saying that to not have me freak out. I'll get my period on the 21st but I don't know if I should wait that long to take a PT. or to do it after two weeks. I've been feeling like pinches on my abdomen area, itchiness, and I'm just overall a bit stressed and worried. I feel like my body is changing but I don't know if it's just me seeing things where there aren't any. I'm 19 and honestly I wouldn't want no baby right now.