You have posted the same post twice at Pregnancy 21-34 community.
If you want an expert opinion you should post this at the forum: Pregnancy. Go down and at right corner you will see there is Related Expert Forums and just klick in Pregnancy. Than post you problem there. Dr Keith will respond to you. Hope I was helpful.
I'm sorry for your loss, first of all.
1 in 4 pregnancies end in miscarriage, unfortunately. There could be several reasons why it happened, or there could be no reason - chromosomal abnormalities, infection.....usually it's natures way of ending an unhealthy pregnancy, so it's nothing that could have been prevented.
I had a D&C after a missed M/C (my body did not expell the tissue and essentially thought that it was still pregnant), so the D&C was to clean out my uterus. Anyway, I was told to wait 1 week before resuming sexual intercourse and 3 months before trying to conceive again. Many women are told to wait only 1 month before trying again.
There should not be problems with conception if there were none the 1st time and her uterus is "clean" . In order to be sure, she can have lab work done to confirm that her hormones have gone back to zero.