pregnancy

So I have taken two dollar store tests and both say negative. There is a place called Care Net in my town that is free and confidential but it is closed until the 19th. I was 10 days late last month and had to force my period by drinking a bunch of orange juice (vitamin c). I'll be 18 september 29th, I'm a senior in high school, and my parents think I am a virgin so.... I dont know what to do. I am going to test at care net once they're open again.