Medical consensus is that the Corona vaccine and booster may slightly affect a woman’s cycle, but that any effects are short term.
If you have observed all of your vesatot, including (at minimum) a bedika on or following your veset kavua (if you have one) or onah beinonit (if you don’t), then you and your husband may resume relations as usual and no further steps need be taken. In that case, though, you should keep an eye out for signs of impending bleeding such as staining, and consider abstaining if you have them.
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This response was updated 18 January 2022.