I'm sorry I haven't gotten to this until now.I've been having concentration problems,so I didn't want that to affect my answer to you.

First off,whenever a person dreams about school, it's usually either because there is an important life lesson they must learn,or else or else it's a sign of having actually learned a life lesson.

I would say the pep rally was representative of feeling like all of your emotions are out there for the world to see(which is very common during pregnancy,by the way).And going off on the teacher may mean that you have frustrations with someone who seems like they are trying to control you.You going off was a sign that you WILL NOT be controlled by someone elses standards,or ideals.

I hope this helps.