How can I detect ovulation based on my menstrual cycle?


  • subtract 14 from your shortest and longest cycle- for example if your periods come every 24 to 28 days, you will ovulate between days 10 and 14. If you are trying to conceive, you should have sex 2 days before (sperm liver 48-72 hours and you want them around prior to ovulation so you will have the best chance for conception), and every 2 days is sufficient (days 8,10,12 and 14).
  • you can take an over the counter ovulation prediction test starting on (in the above example) on day 8.
  • Taking BBTs (basal body temperatures) can tell you that you DID ovulate, but it is not prospective- it is retrospective, and it is hard to use this to help you plan pregnancy.
  • Luteal phase progesterone levels also tell you that you have ovulated, but again it is retrospective.

Related Calculators:

Related Shopping:

Wendy Fried, M.D., FACOG, FACS, is an OB/Gyn with Northern Obstetrics and Gynecology, PC in North Hills, New York

Disclaimer: The information provided in this document is for educational purposes only. It is not medical advice and is not intended as a substitute for medical advice. Only your own physician knows all the important details of your specific medical and personal history and should be the only one to give you advice regarding your own medical care. You should never disregard medical advice or delay seeking medical advice or treatment because of something you have read herein. If you have any questions whatsoever about your medical health or believe you have a medical problem or disease, you should contact your medical doctor or healthcare provider.