My 16yr Old Girlfriend Had Her Period The 12 And

My 16yr old girlfriend had her period the 12 and ended the 16th the 17 we were naked and I was rubbing my penis on her viginia without penetrating and I didn't cum on her,but possible precum I am not sure,we'll today the 28th she wasn't feeling well and had a stomach ache felt like she was going to throw up and had diarrhea is she pregnant? And what are the chances? should I be worried?