Kind of worried

My girlfriend has pcos and is on birth control. The other day I finished in the butt. She went to sleep and woke up with wetness around her vagina and said it was white. She thought it was all out, guess not. Now I’m worried and have to know. Could she even get pregnant with both the pcos and on birth control, it leaked to around her vagina but not into it. Keeping it vague as possible with the needed details