Wow, at 17 I can only imagine the scare of it all, I have had my worries and just worrying is stressful enough, but you have to tell your parents now, the sooner you tell them the quicker they will get over it and accept it, you don't wanna tell your parents when you start showing because when you have it they might still be upset. You might wanna sit down with the father and talk to him first and just let him know and see what needs to happens. I think you will be fine, and most mothers are after a year, but it is alot of stress it has to be and no one said it was going to be easy,
PM me if need someone to talk to..... Wish you luck