In most cases, not only this isn't a problem, but it is a benefit, because most people tend to gain weight due to HRT and, so having such figure will only help you to achieve feminine silhouette easier and faster, so I don't think you should be worried.
Before my HRT, I tried to drop as much weight as I can, but unfortunately, it wasn't enough, because I gained 13 kg. (28,5 lbs) and I was 80 kg. (176 lbs) for months, and couldn't drop even a gram, no matter how hard I was exercising, dieting, etc... The last 3 weeks, when I started progesterone, I finally started losing weight, which is somehow logical, because the estrogen slowers metabolism, and therefore leads to gaining weight, while progesterone balances some of the effects of the excess estrogen and speeds up metabolism, but as far as I know, this mechanism of the progesterone works only when the estrogen and the progesterone are balanced. Also, many genetic women after their 30's suffer from slow metabolism, hairloss, insomnia and are nervous, because in the 30's, progesterone level starts to drop, so there is some logic to work that way to us as well.