Hi! i 'm a sixteen year old Girl w/ a bit of an issue. About 2-4 weeks ago some non consensual stuff occurred. I am worried about STD's and Pregnancy.

Now, I don't track my period, but since I live in an all female home so we should all be starting about the same week. My mother also tracks of periods. My periods are irregular BUT after what occurred I am concerned. Can someone help me out here? Am I pregnant? what should I do if I am? I don't feel ready to be a mother yet; I wanted to at least wait until I was out of school. I also have a smaller uterus than most people my age. if I am pregnant, will it cause complications?