I also found if I've been sleeping on my stomach or side, I have better luck. Seems baby "migrates" towards my front that way rather than when I've been walking around all day. Just a few more weeks and it won't matter because baby will be big enough to find easily!
I have a tilted uterus, and I've never been able to find it until 11 weeks! I'll probably try at around 10 this time anyway... maybe just maybe I'll get lucky!
I have a tilted uterus too! I was sort of wondering if that played a factor in it all. I definitely found DD at 10.5 weeks so I'll try again in a few days for this one. I bet our uteruses haven't righted themselves yet. LOL