Veset haguf for ovulation
28 February, 2005
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.
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.
This internet service does not preclude, override or replace the psak of any rabbinical authority. It is the responsibility of the questioner to inform us of any previous consultation or ruling. As even slight variation in circumstances may have Halachic consequences, views expressed concerning one case may not be applied to other, seemingly similar cases. All health and health-related information contained within Nishmat's Women's Health & Halacha Web site is intended to be general in nature and should not be used as a substitute for consulting with your health care professional. The advice is intended to offer a basis for individuals to discuss their medical condition with their health care provider but not individual advice. Although every effort is made to ensure that the material within Nishmat's Women's Health & Halacha Web site is accurate and timely, it is provided for the convenience of the Web site user but should not be considered official. Advice for actual medical practice should be obtained from a licensed health care professional.
For further questions or comments:
The Nishmat Women's Health and Halacha Site is a public service of Nishmat, The Jeanie Schottenstein Center for Advanced Torah Study for Women. This project and others like it are made possible by contributions from people like you. If you have benefited from the service, and wish to enable us to help others, click here to donate.
Users of Internet filtering services: This site discusses sensitive subjects that some services filter without visual indication. A page that appears 100% complete might actually be missing critical Jewish-law or medical information. To ensure that you view the pages accurately, ask the filtering service to whitelist all pages under yoatzot.org.