Miscarriage and the school system

I'm 18 now, but about 6 months ago I was pregnant with my first at the time(17) and I feared I would miscarry because the tests never got darker, then I started experiencing spotting frequently and was told not to worry and I couldnt stop from miscarrying yet while I was in school I had been nervous that I started bleeding on November 16, 2015 and I was at school these people told me I couldn't go to the doctors and they'd call the school nurse to check on me, the next day I lost my child at that school before class had even started. Its been quite a few months where this subject has bothered me. So my question is should schools be able to tell pregnant students they can't leave when their pregnant, and possibly miscarrying ?