LATE-freaking out

So now I am 5 days late and REALLY freaking out. I'm 17 this is the first guy I've had sex with and only and I'm a senior in HighSchool and going to college to play golf. I can't be pregnant it's just not an option. I'm crying to bad cause I can't believe it. I don't wanna be. I just need some help. We had sex 2 days after my Glow says I was fertile. But I don't know I could be off. I need someone to help me because I will NOT tell my mom. I'm supposed to be the perfect child. She was pregnant at 17 and so was my sister. I'm the first one to graduate HighSchool and go to college and do something great. I can't handle this. It's stressing me out to much.