Usually when you O there's a clear shift in temp, and FF gives you an O date after 3 consecutive temp rises. And then if you're pg, the temp stays up instead of dropping for AF.

I notice your temps are empty dots - are you taking your temp at the same time each day? That can make temps jump around a bit if you're temping at different times. Make sure it's as soon as you wake up. It's recommended that you take it after having 3 hrs of straight sleep, but my chart seemed to be ok with my broken sleep (joys of having a 1 yr old while temping! hehe). But I tried to make it aroudn the same time each morning, and I still got a fairly clear chart.

Just keep BDing and you're bound to catch the egg whenever it appears!