Could be a few things really. My Friend Nessa had a clots too at week 8, 11 and 12 thankfully they did not affect the baby or the sac. Could be possibly from implantation. Are you bleeding at all?

All you can do is rest, drink lots of water and dont do any major excerise (ie, if you only usually walk, just do walking)..I was told this especially as I have miscarried before.

Talk to your little one. I know it may sound weird but positive vibes are good for baby.

Bel