Hey, if you haven't yet, YOU NEED TO TELL YOUR PARENTS RIGHT NOW.
YOU ALSO NEED TO TALK TO THE POLICE BECAUSE IT SOUNDS LIKE YOU WERE DATE RAPED.
As for the pregnancy thing, your boyfriend's a jackass if he can't understand the shit situation you're in isn't your fault. Whatever route you decide to take with that, it's ultimately your decision and no one, I don't care who they are, can judge you for it.
If you need to talk further, hit up my profile.
-Adnarim Smada