Hi wheels and others going through this - I'm so sorry you've had this experience. My first pregnancy was very straightforward and resulted in DS, so when I got pregnant again I was really relaxed about everything and wasn't really worried about miscarriage. Then it turned out to be a mmc. It was an awful experience. You get to that 12 week scan (14 weeks in my case as we were on holiday at 12 weeks so delayed it) thinking you're through the danger period, only to be told there is no heartbeat. In my case the baby measured 9 weeks. No idea when it died, but I am grateful in a way that it was a mmc as miscarrying whilst on holiday would have been even more awful. Even now, I find it hard to look at those holiday photos - there are pictures of me with DS and a little baby bump which I find very painful to see.
I opted for a d&c on the advice of both the consultant at the hospital and my SIL (an obstetrician). I found it quick and painless and recovery was straightforward. We waited for one cycle before trying again, and then on my next cycle I got pregnant straight away. I was very nervous for the entire pregnancy, but it was straightforward and I now have my beautiful DD who is 12 weeks.
I think of it now as nature giving me the family I'm meant to have, because if I hadn't had the mmc I wouldn't have my dd now. I still think about my little angel baby and like to think that he/she is watching out for us (I'm not particularly religious, but it gives me some comfort to think like that).
It helps to post on MN - in the Conception section there are threads for women who've had mcs and are ttc again, which I found very helpful when pregnant with dd. Also, talk about it in RL if you feel able to - so many women afterwards told me about their own miscarriages. It's (sadly) such a common experience to go through, and it helps to hear about others who've been through it - especially when the vast majority go on to have healthy babies afterwards.
Finally, please be assured that all medical evidence suggests that having one or even two mcs in a row doesn't lessen your chances of a healthy pregnancy next time. Even 3 mcs doesn't necessarily indicate that as there are lots of treatments now available for recurrent mc.