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You work out it out from the first day of your last period.

For example:

say the first day of your last period is the 1st Jan, the fertilization would take place on the 13th,14th or 15th day from then on. So you would conceive maybe on the 13th, 14th or 15th of Jan, but the most fertile day out of them 3 would be the 14th this is usually the day when the egg is released from your ovary.

This information is right if you have a 28 day cycle

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Q: How you calculate the fertilization day is it calculated from the 1 day or last day after the period?
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