I use a purse too, I know
high school you have to carry more things,
having a locker will help you a lot, specially since you're pregnant teachers will understand if you arrive a few minutes late do to having to go to your locker, only carry the necessary stuff. Trust me like someone said, they will treat you like a fragile puppy & you enjoy it lol also for the uncomfortable seats, maybe you can bring small pillow or small blanket to lean your back on or to sit on or w.