Reverse Due Date Calculator (("According to my calculations, given the baby is due on Friday, May 9th, 2014, this would put the conception date on or around Friday, August 16th, 2013"........ The 16th is the day we checked into our resort in Missouri! I guess if this baby is a boy, it WILL be Branson Donahue! LOL))
BabyCentre "Pregnancy Milestones" helped me understand why due dates make no sense to me--on the day of conception you are considered "two weeks pregnant" because doctors count from the start of your last menstrual period.
Pregnancy Due Date and Gestational Age Calculator - Calculate by: Conception date (date of ovulation, egg retrieval, or insemination) Date of 3-day embryo transfer Date of 5-day embryo transfer Due date by sonogram (reverse calculation) First day of last menstrual period FULL LIST OF MEDICAL CHECKPOINTS included with corresponding dates.