for my friend cum on her pants and blanket

My friend in dec of last year slept with her SO and he got very wet and sweat mixed with probably cum. She was wearing pjs and panties. My question from her is to know if she is on the pill. If she has any chance of getting Prego. Even if she was wearing close and she doesn't think any got from the blanket to her Virgina. And answers would make her day a lot less stress thanks. I told her I had a same kind of situation in a way and not so tried to help her. But cum can't travel through clothes. Not to mention through two things of clothes and blankets. She did say she touched the blanket but than noticed it was wet so washed her hands and switched blankets. So any thing to worry about ??