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

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Inconsistent onset of bleeding with placebo

8 February, 2012


I am on birth control and always get my period when I am on the placebo pill. However, once I start the placebo there is variation as to when I actually get my period: sometimes it can be the following day, and other times it can be up to three days later (or anywhere in between).

How do I establish a veset, since I don't get my period at a consistent interval after starting the placebo? Should I be choshesh for the onah in which I got my period the previous time?


Some women establish a specific veset kavua based on when they took the last active pill (e.g., they always begin bleeding during the 4th onah after the last active pill). Other women do not establish a specific onah, but a limited range of onot during which the bleeding will begin (e.g., the bleeding begins anywhere from the 3rd through the 6th onah after the last active pill).

Based on your description, you have established an extended onah from your last active pill. You should observe this onah from the earliest interval after the last active pill at which you have begun bleeding, through the latest such interval. You should abstain during the entire extended onah and perform one bedikah daily.

You can see our article and related FAQs on vesatot and hormonal contraception for more details.

Please feel free to get back to us with any further questions.

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