Hi, if your periods are irregular by being 2-3 up or down than your expected date of periods then you can calculate your safe period with a big window period of 9 th to 16 th day (the first day is the first day of your period) but if your periods are very irregular then it is not possible to calculate a safe period and I advise you to use some protection like condoms. You can also use pills since they will also regularise your periods also. Thanks and good luck.
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