I'm 15 and pregnant

I'm 15 and 3 weeks pregnant, only found out yesterday..I want to hide the pregnancy and need advice on how I can do that, I do not want to be forced to get an abortion. I'm writing my final exams in November so I'll be done with high school before I start showing. What should I do? My whole family will turn against me and there are no facilities here to care for me and the baby