it's possible he may have been to rough or it just irritated your cervix .
If it's light bleeding and goes away in a couple of hours I wouldn't worry however if you are bleeding heavily you should see a doctor ( consider a planned parent hood which is very discreet ) or just tell your mom yeah she may be upset at first but she will be glad you came to her for help
Honestly I hope you are using protection first off, second you could have torn some of your insides because you are young and should not be having sex, or it could just be your period, if the bleeding persists you need to have a doctor look, and please please use protection, if you don't have a job or are self sustained you can not have a child and they deserve better, you should go see a gynecologist especially if you are sexually active either way.