Miscarriage Disaster

Wondering if anyone else has experienced a miscarriage disaster. I was 9 weeks pregnant when we noticed the baby wasn't growing correctly. The heart stopped on July 29th (11 weeks). I had a D&C; on august 1st. On august 16th during my follow up it was determined I needed another D&C.; They still couldn't get all of the tissue so I took Misoprostol. The medication didn't do anything so I have a THIRD D&C; scheduled for this Friday. Is this Normal? This sounds extremely excessive! I just want to move on from this experience. It took my husband and I 10 months to get pregnant. They determined the baby had Trisomy 18. So now I have the fear that all my eggs will have Trisomy 18 on top of the miscarriage disaster. Any advice is appreciated!