Panicking slightly

Remember when I talked about my friend taking advantage of me at the party last weekend? Well apparently he didn't use a condom, he bought me the morning after pill but those aren't even 100% affective. And now my period is 7 days late, so I'm freaking out and if my older brother finds out he'll kill him for raping me and knocking me up, SENIOR YEAR IS GOING GREAT GUYS. But other than that I decided I'm not going to self medicate with drugs and alcohol so shit like this doesn't happen, I need to be more aware