I came in my girlfriend on day 5 of her period.

My girlfriend and I had sex on the 5th day of her period without a condom. I pulled out, but cam inside her a little. She said she urinated some of the semen out after sex, and she has also been on birth control for a little over a month. However, since she was on her period she was on the iron and sugar pills part of the birth control. What are the chance she can be pregnant? Any help will be much appreciated!

Thanks!