Nat, it may be too early given your BT is on Wednesday. If I were you (and I must emphasise this is just how I do it) I'd be preparing for a BFN and should a BFP eventuate then it's an awesome bonus.

As for us, totally convinced it hasn't happened this time. DW had a few symptoms here and there (mostly related to progesterone supplements I reckon) but has been totally normal for the past two days. Not even sore BBs! It's funny actually as she tends to have sore BBs most of the time when not on cycle, but during this cycle she hasn't. So anyway, I'm fairly pumped about transferring our last two embies early next year as our chances woudld have to be slightly better in the case than with one embie you'd think.