Assoc. Prof. Sabri Berkem ÖktenGestational Age Calculator Enter the first day of your last menstrual period:Day:Month: JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberYear: – According to these data, you are currently weeks days pregnant. ( there may be a margin of error of ±3 days).Estimated Date of Delivery (40 weeks): Contact Us