You are not stupid, its not your fault, please don't blame yourself.
I know exactly how you feel, it happened to me several years ago. I didn't tell anyone, I kept on throwing up for weeks, I thought it was because of the thought of 'it'. I felt 'dirty' and I couldn't get clean. I was so ashamed, I thought it was my fault.
I only told someone when after three weeks I was still throwing up I saw my (female) doctor. She examined me, I had a broken rib, was very bruised and yes, I was pregnant. The doctor was very patient and understanding. She urged me to have some emergency councelling, I refused. I had a termintation a week later.
I so regret not having the emergency councelling, if you don't do anything else please, please have some. Your head is all over the place at the moment, you are still in shock, I still can't really remember the weeks following the rape, I was still in shock.
Please get in touch with rape crisis or your doctor, I know how hard it is but you need to talk. Don't worry about the police now, but I can't urge you enough to seek some councelling.
Please don't think it was your fault, it wasn't.
I'm here if you need to talk to someone who knows how you feel.