A Friend Of Mine Was Meant To See Her Period

A friend of mine was meant to see her period on the 18th of this month. she stayed with her boyfriend but they didn't have sex, he just rubbed his dick on her pussy n fingered her but he never ejaculated. it happened on a Friday by 11-12pm.she took postnor 2 just in case on Monday by 10-11 am. she has been so uncomfortable n almost running mad that she is pregnant. is that possible since people say that precum can make u pregnant