I am wondering if my girlfriend is pregnant We

Patient: I am wondering if my girlfriend is pregnant. We had unprotected sex for a few minuets and I did not ejaculate at all. I had urinated multiple times before sex to clear my urethra of any sperm that could be left from previous masturbation as well as washed my penis. She has had her period but it was different than usual. It started light and went to a heavy flow. I want to know how likely is it that she is pregnant.

Doctor: