I Had Sexual Intercourse On Thurday 3/24 And He Cam

I had sexual intercourse on thurday 3/24 and he cam in me and im 17 and i can not can not have a baby, my question is i have a strong feeling i am pregnant and if i am, how can i have an abortion without my parents knowing? Whats exactly going to happen if i do? how much is it gonna cost? what else can i do? Plan b? Is it too late? im freakin out because i cant disappoint my mother nor my family by havin a kid and i know not havin a baby is the right thing, i still have my whole life ahead of me.