If you’re trying to conceive it can sometimes take a while before you are pregnant. To increase the chance of becoming pregnant you can try to determine your fertile period. Having intercourse in the fertile period can considerably increase the chance of becoming pregnant.You can determine your fertile period in a few simple steps, up to 6 months in advance. If you are already pregnant you can use the calculator to determine your expected delivery date.The calculations are based on the fact that ovulation takes place 14 days before menstruation. No indication can be given for menstrual cycles exceeding 35 days and less than 21 days.Select the first day of your last menstruation, the average duration of your menstrual cycle and then click on "Calculate".Included tips for a girl or boy.