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

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Missing ovulation with 28-day cycle?

3 December, 2015


I am nervous that I am suffering from halachic infertility.

I have been trying to get pregnant for almost a year. I got pregnant very easily with my first, and I know other factors come into play, but since giving birth, my cycles have evened out to 28 days consistently.

When I gauge my ovulation, and look up ovulation calendars online, I see that I am missing my first night of fertility due to niddah.

I got my period on November 26th in the evening (November 27th). I can only do a hefsek taharah at the earliest on December 2nd. However, I will be fertile as of December 8th, the night before I go to mikveh.

I was wondering what one should do in this scenario, and if this sounds like possible halachik infertility, or if I have been unsuccessful for other reasons.

Thank you.


Ovulation usually occurs between 12-16 days before the next period. With cycles around 28 days, it is possible that you are ovulating prior to immersion. In order to clarify whether this is the case, we suggest a combination of FAM techniques (see more here) and of ovulation tracking with a urine test kit.

If it turns out that you are ovulating before immersion, the first step is to make sure you are immersing as soon as possible.

For starters, it may be possible to get an earlier hefsek taharah, by cleaning yourself out thoroughly (in a warm bath, etc.) and attempting a hefsek on day 5.The hefsek need not be completely clear. Brown lighter than coffee with milk, with no reddish tinge, is acceptable with no need for expert evaluation. Any questionable attempts or bedikot (e.g., darker brown) should be brought to a halachic authority for evaluation explaining that you are having difficulty conceiving.

You can find more information about ovulating prior to immersion in our site’s article, here.

In any case, since you have been trying to conceive unsuccessfully for a year, we recommend consulting your physician for a fertility work up.

Please get back to us with any further questions.

You may also find it helpful to consult a Yoetzet Halacha Fertility Counselor. (This is a free service, details here.)


This response was updated on 22 November, 2020.

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