You have to see a doctor and make a chart over your cycle. You then have to pee on a stick to find out when you ovulate. This system is far from foolproof since only 12% of all women ovulate the same day each month and if you have a orgasm it can make you start to ovulate again. If that happens you also have to remember that a mans sperm can live inside you up to 5-7 days.
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