GBD, I think it is crucial that you both get along well with your FS. If you are uncomfortable with him for whatever reason, I'd certainly think about getting a second opinion. Tos ome extent doctors can only interpret medicine, so different docs can approach the same issue in very different ways. There is no point sticking with this bloke if you feel you can't discuss your views with him.

That said, you need to be mindful of accepting the doctor/s educated view on matters, provided that they can reasonably and happily justify it to you both.

And finally, try not to stress too much. It's still reasonably early in your TTC journey and you have had one early m/c which indicates to me that things are heading in the right direction if only from a purely mechanical perspective. By all means investigate potential issues, but don't exhaust yourself trying to cover all the possible bases at this stage.

Good luck.