Me and my gf had sex twice on Saturday night and Sunday morning. I urinated before the first sex and and know i was clean but i didn't use a condom. After we had sex for awhile I felt it was on its way i took out my penis out well before i had to cum. She finished me off in her mouth and i rubbed the rest off with a wipe, I have never experienced precum with masturbation and don't think i had it during sex either, but i know if i did it could have been holding sperm.. After that we fell asleep for about two to three hours and woke up and had sex again.. This time i also didn't cum inside her and pulled out well before I came and finished myself onto the ground... She was on her last pill for her cycle and had it that morning... She also missed two days that moth with her pill and made up for it the following day by taking two on both occasions. About 30hrs after her pill she told me she had her period, but im wondering could she still get pregnant and how we can ensure she doesnt, im 17 years old and did not sum inside of her..