Day late

I was suppose to start my cycle today. Last couple mths i have actually been getting cycle 2-4days earlier than expected but not this mth. Is my body playing some mean trick on me to make me get my hopes up that im pregnant this mth (been trying for 3mths to concieve). I dont want to test cause i know as soon as i go buy a test i will start my cycle and be crushed and all emotional. I have my kids and step kids so i dont have time to get all emotional because they will want to know whats wrong with mommy :( what do you think i should do? My luck now that i post this i will start in the morning :( ughh i will update.