I'm late by 10 days... And I'm freaking out...

I'm 17, and super athletic... If I ever miss my period it's 'cause I'm either stressed out to the max or I'm just really depressed.. And I'll start like a week later.. But I'm cramping off and on, my boobs are sensitive, my lower back will hurt off and on, and I'm always super tired and hungry... I don't want to to be pregnant at a young age, but if it's god's plan then so be it.. But I need some type of help.. So if anyone has any advice or can help me in anyway at all, it would be greatly appreciated..