Good point about the antibiotics MrsBtobe and as in your case I would encourage women to advocate to have their D&C done under ultrasound guidance as you did. Unfortunately it seems to mainly be private AS aware Gynos who are most willing to do this.
Prof V seems to use antibiotics for every uterine surgery he does. I took them for each hysteroscopy I had with him to minimise the introduction of any infection (as well as the estrogen therapy and the barrier gel to stop adhesions reforming).
I was sorry to hear of the confirmation of your AS diagnosis, was your scarring also able to be removed at the same time or are you facing further surgeries?
Wishing you the best of luck and agree you are in the best of hands