Early symptoms?

Hey guys!! I've been TTC since august. Started taking folic acids and prenatal vitamins in august as well. My period is due this weekend but I've been feeling strange. What are some early early symptoms? I've been having REALLY bad cramps left side and middle (never really even had cramps with my period). Not much of an appetite and when I do eat I have run to the bathroom right after.. having a lot of diarrhea (sorry if TMI), sore boobs.. I'm praying it's all early pregnancy signs BUT I'm trying not too get too excited (incase it's side effects of vitamins) Advice? Opinions on this?

Thank you!!!