If you bleed for one day it is a period?
The way I understand it, is that if you bleed for one day it can
be a period. But you are really the only one who can answer this.
Is your period normally very short 2-3 days? Have you been under a
lot of stress, maybe started a new exercise program, or a heavy
school load, did you start taking new meds? These are all some of
the things that can affect a period. Now that doesn't necessarily
mean that this is the answer. Now of course the other big one is
that you could be pregnant, if there is that possibility don't take
any chances and at least do a home PG test or go to planned
parenthood, where they do it for free. GOOD LUCK