Weight gain and progesterone

Has anyone been on oral progesterone and gained weight? I have been on it since I ovulated and am on it till 13 weeks. I am currently 11 weeks 4 days. I have eaten well and exercised and I have gained weight! I am usually 135 but I got weighed yesterday at the Drs office and I’m at 148! I don’t get it... I haven’t been eating more than i normally would and I have been exercising and I drink 1 gallon of water a day... I just don’t understand!! Has anyone else had this issue???