Possible pregnancy or PMSing? lol

I'm CD 33, 17DPO, my period is due tomorrow on Nov. 28 but I'm very emotional, weepy, sad, worried, and depressed. :-( I don't know if my cycle is about to start or if I'm having early symptoms of pregnancy! I'm confused. Are any of you ladies in the same boat as me?! Prob the majority of you are! lol