I Can’t Believe I Did It. Now I’m Scared

Last weekend was our high school homecoming. A guy two years older than me that I’ve had a crush on since school started invited me to the dance.
He took me to a nice restaurant for dinner before the dance then after the dance we parked at a spot that kids from our school hang out.
I’d never parked with a guy before so we kissed for a while getting more serious as the time passed. Then he started his hand up my
dress. I didn’t stop him so he quickly put his fingers in me.
The more we did the more confused and excited I got not knowing how to stop and I let him have sex with me.
We didn’t use protection and when I got home my panties were such a mess I flushed them so my mom wouldn’t find them when doing laundry.
I’m so scared I’ll get pregnant because he really done a lot and when he did it inside me I shook all over.
My period doesn’t come for another eight days so I’m a nervous wreck.