Shoesize shrinkage

I've only been on hrt for almost 3 months now. I knew there was a possibility that this could happen due to things realigning, but really? so early? I noticed something was different with my feet just recently. At first I thought that the Wintershoes I'm wearing on a Daily basis were just stretching out but then I tried on my summershoes which I wore just before I got on HRT and there it is, i've actually gone from european shoezise 43 to 41. I have not lost any weight or anything so it is not because of that. Have this happened to anyone else this early on HRT?