I know that in a "normal?" pregnancy, you figure your due date by looking at the day your last period started, then go back 3 months and add ten days. In a donor IVF cycle though, do we calculate this based on the donor's last period? I asked on the phone to the nurse last time I talked to her, and she just said they'd go over all that with me on the day of the transfer. Just anxious to plan the fantasy in my head..............guessing that since transfer is going to be midMarch then I might be looking at an early December baby. Not sure. She said it is calculated on the age of the embryos.