OK- well just talked to FS- they said to wait the results of the testing on the placental material etc taken in the D&C...if there were any chromosomal abnormalities there, then that indicates a problem like downs syndrome, in which case a miscarriage is the body's natural response. however if all seems normal, then they suggest we have the further tests done...as soon as next week, which is great.
it will then be 3-4 weeks before we get results.
Interestingly, the FS (who is not my normal one, as he is away- and like this lady more!) said she would probably recommend we try naturally for 6 months and see what happens, since my left tube obviously does work. there is of course, a higher ectopic risk, but the chance of natural conception without IVF...so more food for thought.

thanks again lovelies