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Enter the mother's pregnancy information into this calculator and JavaScript will provide an estimated conception date, birth due date, and an estimated current fetal age. Great for all those mothers-to-be! Last Menstrual Period: (MM/DD/YYYY format) Average Length of Cycles: (22 to 45) (defaults to 28) Average Luteal Phase Length: (9 to 16) (defaults to 14) Estimated Conception: Estimated Due Date: Estimated