Congrats mrsmac on being PUPO! Yay!
Things can change very quickly with embryo's so when they looked it may have been 2 cell but 5 minutes later it could have been a 4 cell. And they say that the sooner they are back in their natural environment of the uterus, they thrive! Now for the wait, hope it goes quick for you!
BT tomorrow morning finally! I should get results by 2pm tomorrow.