The standards days methods is a calendar based method of contraception which is suitable for use by women with menstrual cycles 26-32 days in length.
Select your last Menstral Date:
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Prev
Next
March
2025
Su
Mo
Tu
We
Th
Fr
Sa
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Start date of fertile period for this menstrual cycle:
End date of fertile period for this menstrual cycle:
If you intend to have intercourse between
and
you should use an alternative method of contraception.