So my girlfriend is on birth control but she had taken a two week break from it and started it on Sunday and we have never had sex but 5 days later on the Friday night we were naked and rubbing my penis on her vagina but not in and I ejaculated mostly on my stomach but she went to the bathroom to clean off so I think a little bit of it may have gotten on the lips of her vagina but she said she doesn't know if it did. She took a plan b pill less than 3 days later, so yesterday. We're both worried and wondering how likely it is she's pregnant.