Vics, I am very sorry for your loss. I mc'd at 5 weeks in Jan, only knew for five days and I know it's still a bereavement.
I've actually had two mcs this year (although have one DS, so in a slightly different boat to you) but am now 20 weeks pg, so looks like I've just been horribly unlucky. The same is almost certainly true for you, although I'm not dismissing your fears at all.
People I've known that mc'd before going on to have one or more babies include my own mum (three babies, no trouble at all), a work colleague (two mcs, then two beautiful children), and several good friends.
Not to mention the very many friends who've had one SINCE having a baby.
Once you've had a mc, and started talking about it, the number of women that say 'yes, me too' is staggering.
MN has been a total lifesaver for me, too, like tunnocks said.