Could i be pregnant?

So i had unprotected sex a while ago, but he pulled out ( i know thats not safe:( ) anywho, i’m almost never late for my period, maybe one or two days at the most and im on my 11th day without starting... I can’t talk to my mom about it or get put on birth control. I did take 3 pregnancy tests already so far and they all have said negative. I’m probably going to go to planned parenthood and see whats going on but i dont have a lot of money cause in only 16. Does anyone know if they charge or anything? I have insurance but i don’t want to use it incase my parents see it.