As long as things feel ok, I'll wait until 12 weeks.
I was exactly the same last time, I noticed that I wasn't as tired or hungry, and boobs weren't sore for much more than a few weeks, but thought everything was fine until I started bleeding. That was when I had the scan, no heartbeat, too small, miscarried later that day. Sounds so quick like that, but as you know, it's really completely horrible...
What stage are you at now?