Weight gain?

Tyasia • Life’s what you make it ❣️

So ever since middle school I’ve been the same weight and height. I’m 111 and 5’4. I’ve actually recently started to gain weight. But only like a pound or two then I’ll drop down some. I’m real petite. With me being on birth control I thought I would gain weight but I haven’t gained nothing. It’s not what other people think of me or anything dealing with self esteem, I just want to gain weight for myself. I’ve always been skinny and I’m ready to just gain a few pounds. I’ve heard weight gain powder from GNC works good. I really don’t want to gain too much, and blow up. I just want to get to 120, 125. I also plan on going to the gym also. Does this sound like a good idea? Have anybody tried weight gain, and will it make me gain to much? I just want to take it for a little while to get my desired results then stop.