Birth control

I have an appointment to discuss my options of birth control, and i will get one of the birth controls. But I’ve read through them and im not sure which one to get. I tried to get the pills once but my mum found them and didn’t approve. I wanted to get the shot or the implant but it will stop my period and i know if i dont get my period i will freak out. Help?! Me and my boyfriend are sexually active and we’ve been doing it unprotected for like 4 months now😭 i just dont want to get pregnant im still a teen but the birth control options are quite hard for me because i dont want my mum to find my pills again