I'm not completely sure of the precise timing but you can use the basal body temperature of the woman to tell when she'll ovulate. Then the timing when you copulate can make a difference in what you procreate. We have a daughter - completely my accident. No planning in any way to have a child or not or even the gender. I do know that if you talk to the right Dr they can direct you in the right way to manage the choice "naturally". Good luck.
Here's a link which might help you.
http://www.ovulation-calculator.com/...prediction.htm
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