It is permissible to immerse on
Friday night even if it is not your original night to immerse. One should not deliberately
delay mikvah to Friday nights for reasons of convenience.
In extenuating circumstances it is permissible to immerse right after sunset. Immersion during the day is rarely permitted, and then only in extremely extenuating circumstances.
For the future, questions that require an immediate answer are best directed to our
telephone hotline.