help me!

im so worried. My bf and I were messing around and I got him off and then went to the bathroom to wash my hands. I came back and a few minutes later he fingered me. 

Im worried because I'm a very paranoid person. I'm trying to analyze every possibility possible. 

What if he had semen on his hands and then fingered me? Could I be pregnant?

 

ive had stomach cramps and stuff. 

Am I just over thinking it??