HELP SOS

so I just had sex with a guy (we will call him dick head) and well dick head was like “I’m gonna finish I’m you” and I said no and he did it anyways. Soo problem bc I just started birth control last week (like first time ever) and I know it isn’t gonna work) I have no money and he only gave me $20. I don’t wanna get off brand but if that’s the case then I’ll do it. but if y’all have any other suggestions PLEASE LET ME KNOW