Tell me I'm not alone?!?

I'm trying my hardest to eat healthy avoid medications that I wouldn't want my baby exposed to if I was pregnant avoid alcohol and my Pepsi, and every time AF comes I think, well I could of had a drink on New Years what would it of hurt?!? Or the Pepsi with dinner, or my chocolate from Santa..... (AF came this morning so became rather depressed b bought myself a candy bar n a Pepsi) back to being a good girl tomorrow,