this case is isolated. The Principal made her decision, either the teachers sue her or file an administrative sanction against her. I'll go with translator, whatever the Principal is thinking in imposing the rule, she has her reason/s and until such reason/s are questioned in the proper forum, then it will remain.

It will be a case to case basis again. There are woman who have difficulty in her early weeks while there are those who can be as normal as she can be even in her late pregnancy. But the Principal's idea is for her school's projected accomplishment and asking the teachers to postpone or plan their pregnancy is part of her planning. I suggest affected teachers should challenged this ruling or find another job!