81.7.Notwithstanding sections 81.4 to 81.6, the Government may, by regulation, determine the duration of the maternity leave or, where applicable, any extension thereof, the time at which it may be taken, the notices that must be given and the other conditions applicable
(1) where the delivery takes place after the expected date;
(2) where there is a risk of miscarriage or a risk to the health of the mother or the unborn child;
(3) in the case of a miscarriage or stillbirth;
(4) where the state of health of the mother does not allow her to return to work at the end of the maternity leave.