Carol, as we all know, 38 could be 37.9 or 38.4, and of course, 39 could just as easly be 38.6, and thereby only 0.6 above last time?
When I was newly diagnosed, I was astonished by my drop at the first testing point, and quickly realised there was a limited room for improverment thereafter. From the point of having the blood drawn for my second test, post-diagnosis, I have always, always had a range in my head which I have as acceptable. It's strightforwardly a +/- number. The number being irrelevant, as it only applies to me, in my little head.
Thing is, so many things disrupt our perfect results - sleep, changes to meds/treatments, new conditions, stress and so on, and for me, stress can be a bit of a telling issue. The first time I saw a rise in my A1c was when it covered a tricky period of tests, biopsies and surgery. That was a real learning curve for me.
Cut yourself a bit of slack. That your thyroid regime has been changed could so, so very easily be in this mix as the more I learn of thyroid issues, the more I realise how intricate and sensitive it can all be. If your current thyroid regime is still sub-optimal for you, that could also so easily be impacting on the cling-on nature of few pounds you have accummulated.
Take a step back and look at the options available to you, versus quality of life and the quality of life of those around you who travel this path at your side.
38 is well into the normo-glycaemic range, and having met you, I can attest you are a very trim lady, so there is much to be happy about. Stick your tongue out that 38 and try to move along.
Maybe consider giving yourself a testing/results window? I found it really helped me deal with the variiations I haver seen. As a bit of a perfectionist, I had to find some way or staying sane,.............. ish.