Sinking feeling

So I'm supposed to get my period tomorrow according to glow.. Been having some random cramping the last few days.. I just have a sinking feeling in my gut that it's not my month.. Why oh why must I put myself in such a sour mood about it.. Boob sore and been sleepy all the time. Symptoms as well of when I'm gonna get my period. Any advice on trying to be positive during this time? Ugh 😓😓