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Hello, I am in new zealand too, and that thing about having to leave due to pregnancy is in most schools. Even if every young person here petitioned and fought against segregation, which technically it is, it is impossible here to get a law passed in a couple of weeks, most legislations are passed in a couple of years (I am currently a law student). So trying to get something passed is not going to help those currently pregnant, and very certainly could ruin their education.
You are absolutely correct on how long it takes to change social norms and the laws that enforce them. We must not only fight for change that may directly benefit ourselves, we must fight for change that will benefit those who are yet to come.
I encourage you to begin the movement to change these unfair practices. A pregnant mother who is literally creating a future for our species should never be looked down upon or hidden away. She should be heralded for her sacrifice and assisted by those around her. That is what culture shift is all about — changing the way people see the world around them.
Change begins with YOU.