If a woman is taking pills for the purpose of (halachically permissible) contraception, is she required halachically (or even if not required is it halachically recommended) to skip the pill every few weeks so that she gets her period? Her doctor said that medically there is no reason for her to do so. The essence of the question is really whether there is something wrong with pushing off a natural period and thereby not fulfilling the typical mitzvos associated with a woman getting her menstrual cycle.
There is no need to do so. There are mitzvos to do when she has her period and others to do when she doesn’t. Aside from this, there is no obligation to cause oneself to be in the situation of doing those mitzvos, as it only applies when she has her cycle.