Answers (4)
Maybe you know the answer already but I would say, the period of a woman is not always the same, it depends on.
Some have a period of 30 days, usually it's 28 days.
So to count, you check when you can have your next period again, and you minus 14 days to it, that is the ovulation day.
The man spermatozoa can live from 1 to 5 days but the ovule of the woman is only some hours. So just be on time if you want a baby :) if not avoid those moments.
:)