if you mean actually give birth at school i assume everyone who hasnt dealt with pregnancy before would freak out (students and some teachers) pretty much all the students will probably freak out and start panicking (making you panick) and not know what to do, hopefully one or more will alert a teacher who can call an ambulance, from there they will probably find a teacher with knowledge on birth to comfort you through it untill the ambulance gets there
I'm pretty sure that if you went into labor at school, a teacher or another adult would have you taken to the hospital. It's hard to hide hard labor.
or as phrannie said the teacher my also take you to the hospital
btw i not preg i just curious