God I am so glad I went to an all girls school back before being trans was a thing.
Starting periods is so hard, I remember being mortified at making a noise while changing my pads at school and that was around other girls. I can't imagine how terrifying it must be to have some animal of a boy kicking the door down while just using the toilet.
This new unisex toilet thing really makes my blood boil, girls will miss school, they will get sick from holding in wee all day. It's shocking that schools care more about pandering to a very small minority of people than they do about girls. For the nice boys it must also be hard, because decent men/boys do not want to invade female spaces but have little choice if they want to use these toilets themselves.
If the school carries on with this farce, the pupils between them should decide which toilets will be boys toilets and which ones should be girls. Then the decent boys should call out other boys if they see them going into the girls and vice versa.