I don't know if I'm pregnant

I've had unprotected sex a few times and I started spotting just last week.. I don't know if it's my period or implantation. It's happened to me before but I wasn't pregnant. I want to get a pregnancy test but I'm kinda scared to do it.. has anyone experienced that before? if I am pregnant, how can I get an abortion? I'm only 17 and I don't want my parents finding out.