I’m praying

So 3 weeks ago I was taken advantage of when i was completely drunk and i finally gave in and said if you use a condom we can have sex. So we did and then he took the condom off without me knowing. I don’t even think he finished because I pushed him off me but he kept trying. I am supposed to be starting my period tomorrow but I have no symptoms for my period except some white discharge and getting super angry easily. I am feeling nauseous (maybe because I am super nervous). Usually before my period I break out, become super depressed, and have cramps. But none of those have happened. I am on birth control as well, but missed it the night this happened. I cannot tell my parents about this I am 19. I don’t know what to do except pray because usually my period is usually spot on.