So I was at a party yesterday and two of my friends were having sex. They've had sex a few times and tend to when they both go to a party. She's back from uni and he's in sixth form so they haven't slept together in a while.
She was always on the pill so he doesn't use condoms with her. However, she told me before the party that she has been off the pill for a few months, and I know she didn't tell him that.
They had sex three times and he came inside her all three times. (I could hear...)
What's the chance of getting pregnant from having unprotected sex? I can't find any helpful info anywhere and if its a real chance that she is pregnant then I feel I should tell him.