Honestly darling, you are getting older. No you are not that old but it does happen.
You were active in your job before, has that changed? Or your lifestyle, you did get married right? Hormones will definitely play a part but everyone gains weight unless they actively work to avoid it. Gaining weight is something we all struggle with eventually or we decide to forget about, all of your updates have seemed pretty happy all told, sometimes when we are not worrying about everything, well life just happens.
Technically fat redistribution happens from two to seven years and muscle takes a little longer so it seems pretty normal. I gained 38 lbs after two years, I am back down to only 10 lbs above my pre hrt weight. I am diabetic though so not sure if it would be the same thing. Are you happy with the distribution of your fat now?