I have tried to think what I would want people to do or say if I have a negative outcome tomorrow with my test. I think that you can only say that you are sorry and that you are there to talk to if they need to. I guess just don't say things like 'the timing wasn't right' or 'maybe next time'. I know that I feel like I have been carrying a 'baby' of sorts for the last two weeks, as I saw the embryo under the microscope before it was put back inside of me, so if I have a negative result tomorrow, I will feel a real sense of loss. If you keep that in mind then I'm sure you will do the best you can to be supportive of your friends.