chance of pregnancy?

I had (unprotected) sex last week and once before that the day before my fertile week. He pulled out both times. The time I'm slightly worried about is last week. He came on my hip, mostly. I just nervous that a bit may have gotten into me. I'm most likely just overreacting. Nonetheless, what are the chances that I'm pregnant? My period is one day late but that's normal for me. It tends to be late almost every month due to stress.