My dad and birth control

Trinity

So. I’m 16 and I’ve had sex. My mom knows and so does my step mom. But my dad doesn’t. Both my moms agree with me going on birth control.. but my dad doesn’t. He told me “it’s only to save you from getting pregnant when you have sex. That’s not okay. I swear to god if I find out that you are having sex you are dead!” So. I don’t know what to do. Like. I have an OB appointment on the 28th. And it’s meant for birth control. I was going to get my IUD or the implant. I also don’t know which birth control I should do. Oh lord help.