You didn't say how far along in your pregnancy you are?
Also, the heart-beat sometimes does not show up right away... for some women, longer than 6 weeks.
I had a miscarriage once, at 6 weeks. BUT I was bleeding for a few days... and in the vaginal sonogram, there was no heartbeat (where there previously was a heart beat), and the sac was empty.
I had a D&C.
My Doctor told me to wait 3 months... so the body can heal, before trying again.
I did get pregnant after that, after waiting the recommended 3 months... and I now have my 3 year old son. Born healthy, and I had a normal healthy pregnancy.
I had no complications from the miscarriage nor from the D&C.
I would not "rush" into getting pregnant right away, after a D&C. You want your body to heal.
Also, continue taking prenatal vitamins, even while trying to get pregnant.
All the best,
Susan