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

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Onot after miscarriage

5 February, 2003


After a miscarriage, when do I begin calculating my Onot again since there is no previous cycle history now?


We are sorry to hear of your miscarriage.

If your miscarriage occurred less than forty days after your pre-pregnancy immersion, then you observe all of your usual onot perishah: date of the month (chodesh), thirty days (beinonit), and interval. Your interval onah will simply be later than it typically is.

If you miscarried more than forty days after your last pre-pregnancy mikveh immersion, and assuming that you did not have an established veset (veset kavua) before your pregnancy, then you are halachically considered to have no previous cycle history. You have no onot perishah to observe until you start menstruating again. An entirely new pattern will be established after the miscarriage.

First, you need to stop bleeding, complete the taharah process and use the mikveh. Just as after childbirth, this may take a few weeks and the bleeding may be somewhat “on and off.” For more on the laws of mikveh following a miscarriage, please see our article on Pregnacy Loss.

From your first period after mikveh immersion, you calculate the date of the month (chodesh) and thirty days (beinonit) for the next month. You will not yet have an interval. After your second period, you calculate the chodesh, the thirty days, and the interval that you just experienced. It is not unusual for the cycles to be a bit irregular for a few months as the body resets itself to regular cycling.

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