Withdrawal bleeding from HRT does render a woman
niddah if she experiences an actual flow (bleeding comparable to a period). She is required to complete the process of becoming
tehorah in the usual manner, waiting
five days before counting the
seven clean days and immersing.
She will only observe a
veset from when she stops taking the active pill and expects to begin bleeding. See our article on
vesatot and hormonal treatment for more details.
The length of intervals between withdrawal bleeds does not make a difference for these halachot.
Mazal tov on the upcoming wedding! To review halachot of becoming
tehorah before the wedding, see
here.
This response was updated on 4 December 2024.