It might be the hormone fluctuations from starting the TRT, it might just be the higher level of test. if it’s the former, it’ll stop; if it’s the latter, it won’t.
Finasteride/minoxidil work well at slowing/stopping hair loss but don’t do much in the way of regrowth. In other words, get on that stuff early …IF hair loss bothers you. Personally I found minoxidil to be too much hassle, what with the twice daily applications and all. Finasteride is just one pill a day. I know some people have had bad experiences but many more have had great experiences with it.
Personally, I think finasteride is a miracle drug .. seven years on it and my hairline hasn’t budged. No side effects aside from maybe a small reduction in libido, but that might just have been getting older. (started when I was 26). And now with Hims and all the other online services offering it, it’s easier than ever. My only regret is not starting it earlier.