Need help urgent

So I'm 17 I've been with my boyfriend nearly 3 months, and last week we had sex for the first time. 
It was unprotected and he didn't like cum in me or anything but I'm still stressed I'm pregnant. 
Anyways, someone mentioned it at school and they got involved and are ringing parents in the morning. I have to tell mine that we had sex and that I could be pregnant. I'm so scared as I'm not too close to my parents. 
He told his parents and he said they went mental. I'm sure they are going to hate me urgh