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These include the first day of your last period and the average length of your cycle.
By keeping track of this for a few months you can have a good idea when the time comes to try and get pregnant.
If you are already pregnant, you can use the calculator to work out the date of conception based on the due date, which can be roughly estimated by an ultrasound.
For each woman, the conception days will vary and relies heavily on the natural body cycles – although it is worth noting that these cycles can change with stress and outside factors.However, these dates are subject to change and can be pinpointed with more accuracy during a scan.Few women give birth exactly on their due date, with many going overdue.For most women this is 28 days, but you may find it worthwhile to track your cycle for a few months to find out what your average is. Once you have added these details you will be given a number of columns that detail various information you might need. This is the day you are most likely to become pregnant and is given as a range of dates for the next few months.These days usually cover 4 days when you are at your most fertile and most likely to become pregnant.
However, most women can assume that their cycle will be around 28 days as this is the average.