Annatoo,
Your story is very similar to mine. Heartbeat at 6 weeks scan so I then actually accepted that we might have a baby (it was IVF) then a complete shock at the 10 week visit. I also felt that my body had lulled me into a false sense of security. especially when m/s continued for some weeks after the miscarriage.
I can understand how you feel a bit afraid to try again but don't think that time is running out. I had my first child at 40. when you feel up to it, try again and it will hopefully all be different the next time.