Me And My Girlfriend Were Rubbing Our Genitals Together, And

Me and my girlfriend were rubbing our genitals together, and I did run it around her opening but I never went in. I could feel myself starting to so I pulled out of the area. I didn't ejaculate but I know there was precum. She was on her period but it ended the day or two after. Its been a bit over a week and she's been having a bunch of food cravings and its freaking me out. She had a tampon In, if that matters. Could she be pregnant?