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

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Switching from combination pill to minipill

19 June, 2017


I have recently switched birth control pills. I was previously on a combination pill where I got my period every 3 months and am now switching to a progesterone only pill due to some health concerns of my doctor. I got my period on a 1-2 day interval after stopping active pills and was told that that was my vest kavua.

I am now unsure of what to do with my veset? Do I have to uproot my veset? Would my old vest fall out every 3 months? There are no instructions on the pack regarding when I should expect my period and therefore I am not sure when I should be on my veset.


Now that you are starting the progesterone-only pills, which are taken continuously without a week of placebos, your previous veset kavua no longer applies. You will revert to observing the usual three onot (chodesh, haflagah, onah beinonit). This first month you will observe only the yom hachodesh and onah beinonit based on your last period, but not the yom haflagah which was solely based on the pill's schedule. After your first period on the minipill you will begin to calculate all three onot.

In practice, you may experience irregular bleeding or spotting over the first months of use. Take precautions (outlined in our article on stains) to avoid becoming niddah unnecessarily from staining. If you do find a stain that makes you niddah, it will not affect your veset calculations.

Over time, some women stop getting their periods while on progesterone-only contraception. In general, once you have observed all three onot from your previous period, you will have no more onot to observe until after the next time you menstruate.

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


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