New Pill!

I started a new b.c. (LoMedia 24 Fe), it's supposed to react the same way my very first pill did.. Eliminate my period. Well, my dilemma is such that I should be on the red river now, however I'm not. I've been going to the gym as well and working on my abs. Thing is, I'm 98 lbs. So I shouldn't need much work. I'm confused as to whether my pills working correctly and making me gain some weight/bloat in the abdominal area or should I be concerned to the obvious other?