Still nothing, but our enthusiasm is being held in check by some Googling on "Does progesterone delay your period?" - the answer is a solid yes, but not in all cases. My wife called her nurse at Dr. M's office to inquire further, and the nurse confirmed that progesterone can indeed delay a period, but that my wife should continue taking it until her period starts - OR - until Thursday, when if she still hasn't started (fingers crossed) she should call to schedule a blood test for Friday morning.
Another symptom my wife is experiencing is frequent urination - she has to go twice a night (which is unusual for her - has never happened before) The nurse said that this is unrelated to progesterone ... it could be that her uterus is enlarging due to the embryo inside - OR - her ovaries have swelled due to the Femara, thus displacing her bladder capacity leading to more frequent "urges".
Either way, it's a waiting game ... funny thing is, there are no pregnancy tests left in our house. My wife exhausted her supply last month, and is nervous to go buy another one.
Will keep you posted.