Nishmat's Women’s Health and HalachaIn memory of Chaya Mirel bat R' Avraham

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Veset haguf for ovulation

28 February, 2005

Question:

I use fertility awareness (with temperature and cervical fluid) for family planning purposes so know within 24 hours when I will get my period. Is it appropriate to use this information for my onah – I have a somewhat irregular cycle length so this is the only way to have a regular onah – I always get my period 12 days after ovulation.


Answer:

What you are describing may be a veset haguf if you see that it works accurately for three consecutive months. If you get your period exactly 12 days after ovulating and in the same onah – either three times during the day or three times during the night – then you have established a veset kavua, and need only to do a bedikah on the day you know you will get your period.


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