BIRTH CONTROL PILLS?

Hey guys so, recently I was diagnosed with PCOS and fibroids. I’ve had many issues and recently just had surgery and their trying to put me on birth control pills but I don’t want to be put on birth control pills because I will gain weight 😭😭😭😭😭😭😭😭😭😭! Do you guys know any pills that won’t make me GAIN weight. Or Something that won’t change my weight or at least slim me down........ I’m not tryna turn into a elephant 🐘 !!! Swim suit season is coming soon ...... I’m tryna be Beyonce 😂🤷🏽‍♀️