BIRTH CONTROL PROMBLEM SCARED AND WORRIED?

first baby first time taking them ok so im on birth control pills and im not even on the pills were im suppose to start my period im on the ones that are suppose to stop ur bleeding well i quit bleeding for a week and all of sudden i started bleeding again it seems like a period im crapin feel moody and feel like i got gas the blood even smells like old period blood has this happend to yu and is it normal?