Weight gain

MJ
OMG
Okay so I started taking the pill almost a month ago, but I heard the pill makes you gain weight. Over the past week or so I found that some of my pants don't fit me now and my brand new bathing suits don't fit either!
Would exercising do anything? Or no?
I just feel gross now and I don't know what to do.
I've recently been obsessing over my weight and now I'm even more worried.