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Thank you for your query.
If you have regular cycles, here is a simple formula to calculate your ovulation time yourself. Ovulation or release of egg occurs 14 days before your monthly bleeding / menstruation
. So in a 28 day cycle it occurs around the 14th day. 2 days before to 2 days after, that is in 28 day cycle, from day 12 to day 16 is the period during which you should try it.
Hope this helps. Good luck. :)