period symptoms? Possibly TMI.

Brittney • Brittney, 20, Aries. Mylifeasbrittney.com. ❤️
Alright, I'm going through a pregnancy scare (95% not at all just in my own mind. Since I'm 95% sure there was no speed or anything  in me) but according to Glow I'm supposed to get my period in 9 days, sometimes Glow is wrong two days late or early for me but generally 9 days. 
I think I'm starting to have some cramps mow, I'm not feeling very well - slight nausea, not being hungry, pooping a bit more (but I did change my diet). But I'm also super stressed out waiting. 
Is 9 days too early to have period symptoms? I think I've had them this early in the past before and that I'm just really stressong myself out.  Just need some reassurance.