My gf is pregnant what do I do?

My girlfriend is pregnant. We’re both 13. She got it from being raped but she doesnt want to tell anyone else about it. She hopes she’ll just miscarry and if she doesnt she make herself miscarry. If she does get pregnant and have the kid she says she’ll run somewhere far away. Ive told her the questions will never stop and she should tell her mum. Should I tell someone? and if I do she probably won’t ever date me again. come on guys(and girls) this is serious I need all the help I can get, I’m so confused