Possibly prego?

Okay so according to Glow (which has been spot on for me so far) I was supposed to have my period either OCT.31-Nov.1 but I still haven't had one and it's already the 6th. I tested the second day I was late but it showed as a negative. But I've been moody, have had a weird appetite, a tiny bit of cramping/stomach pain/hardness, I'm tired more now, and of course still late on my period. I've been ttc for a while now and have had a few false alarms, but I've never been more than 2 days late. Ever. I am planning on testing again Friday but don't know what I should do if I test negative again. Please tell me what you think about this.. This will be my first pregnancy (if I am) so therefore idk what to look for exactly