Quoting Mommy of a boy & girl :" idk if im constipated tho i poop everyday sorry tmi sometimes/most of the time more than once. But could i still be even going poop everyday??"
Is it hard for you to use the bathroom at all? Even though you're going every day it's still possible to be constipated.
Just call your OB up tomorrow and they'll have a nurse answer any questions you might have about this pain you're feeling. If they think it's anything worth checking out they'll have you come on before your scheduled scan. In the mean time try not to worry too much.