Hi you will not break your bond with you mum,you see the thing is about being a mum is you love your child no matter what. She might be a little mad at first but she will come round. YOU CAN GET PREGNANT BY PULLING OUT. Its called pre come, and you can be pregnant and have a period. I would tell your mum about the mess your in and she will help you cause that's what us mums are there for. and i would do a test the day your period is due, I got pregnant at 18 and it's hard work you are still a kid with lots of things to do and see.And when you have a baby you have to put them first never mind the sleepless nights and crying dirty bums. I am from England and we finish school at 16. And my boyfriend had a job and it was still hard if your not you should ask your mum to help you get the pill or something that is right for you. I'm not having a go i'm just saying live a bit of your life before you settle down, Hope you get it sorted take care .
There's no way of knowing for sure what the possibility is, any time you have sex you can get pregnant, unprotected is just that much more of a risk. Wait until your next period is due and if it's late or doesn't show test.