No bc = weight loss?

Morgan
I stopped taking my birth control bcuz it was causing me to bleed a lot and now I have lost weight. I am small to begin with but I was at 100 lbs and now I'm down to 98 again. I can't seem to keep the weight on for anything and I don't know what to do. My breasts and butt have gotten smaller also. Could it be something to do with my hormones?