HomePregnancy Calculator Pregnancy Calculator Date of Last Menstrual Period: Date 1 234 5678 91011 121314 151617 181920 212223 242526 272829 3031 Month1 2345 6789 101112 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) : Newer Older