Contraceptive pill fails?

I started taking the pill a month ago, I always take it at the same time and haven't forget it not even once... the thing is that since about a week ago i've been feeling pregnant, from the "i feel pregnant" feeling, to nausea, soreness, some weird discharge that I only get when pregnant, tiredness, and headaches. I was feeling pretty great when I started taking the pill, I wasn't getting breakouts, only mood swings.... but i want to know if anyone has heard of the pill failing? Could I be pregnant? My period is supposed to start next week, i will test then, but i want to hear your opinions