Free Pregnancy Calculator | Due Date, Conception Date Calculation Pregnancy Calculator Date of Last Menstrual Period: Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Month 1 2 3 4 5 6 7 8 9 10 11 12 Year Due Date, Conception Date Calculation Results: Estimated Fertility Dates : to Estimated Conception Date : First Trimester Ends(12 Weeks) : Second Trimester Ends(27 Weeks): Estimated Due Date(40 Weeks) :