If someone is underage and pregnant, does your school have the following rights?

[Kate F]

Are they able to tell you you're a disgrace to the school and it's religion?
Get social services involved?
Tell you that you must delete your facebook?
Ring your mother and tell her she doesn't know how to raise you?
Not allow you to enter school for two weeks?
Tell you how you must arrive to school?

Need help, is any of this crap against the law? It all seems so unfair.
i'm not the one who's pregnant. and i live in the north of ireland. so we're under british laws.