Hi Starlite,
I had the same experience as you last yr. Found out i was pregnant in Aug, but had a missed abortion with spotting, and had a d&c done on 18 Sept.
I did ask my gynae if any tests were necessary. My gynae has differing views from yours and Positiveme's. He told me that frankly speaking, a high percentage first pregnancies end up in m/c and most of the time the results show that there's nothing wrong with either party, esp. if it's a 1st trimester loss. He recommended that tests be performed only in cases of recurrent m/c, and asked us to try again naturally. In fact, he said that it'd be good to wait for one cycle to come before trying again (as opposed to the usual '3 mth' waiting period that we often hear of). He explained that waiting for one cycle would ensure that everything is back to normal and it would also be easier to track/date the pregnancy if you do conceive the next round. But he did say, of course, that you should only try again after one cycle if you feel prepared - both physically and esp. emotionally cos usually it's the emotional part which is harder to deal with. As for the physical part, different people have different experiences. At your post d&c check up, your gynae would be able to advise you if your uterus has gone back to normal, if everything has been cleared, etc. These days d&cs are rather neat procedures and everything should be fine in a few weeks' time.
I guess ultimately it's up to you and your hubby to decide if you feel it's necessary to go thru the tests now, or if you'd like to try again naturally. Guess the former would be more assuring to a certain extent.
Do take care now.