CONGRATS! I do remember your post, I replied to it because I had been through something similar. I too, lost a baby (8 weeks along, the baby never developed a heartbeat and I too had to have a D&C) - and we went ahead and I got pregnant again right away. I spent the first few weeks of my subsequent pregnancy scared stiff the same thing would happen. I spent every minute thinking about it. I wanted to buy a fetal heart monitor. I held out and didn't and everything was fine, my baby girl was born perfectly healthy 9 months later.
My best advice to you would be, don't let your last experience cloud this one. I know it's hard not to compare. But try. Enjoy the pregnancy and all the little milestones as they come and try not to worry. I am a firm believer in everything happens for a reason and I look at my 6 month old baby girl now and I know why I had to go through the miscarriage in hindsight. If not, I'd never have this precious girl. Best of luck, God bless you both.