yes this happens.
i know that if i have like 2 days of no activity down there i am really sad. because i want to be daily reqular.
but i know better now not to force a bm.
you'll just have to be ready when you feel the urge the next time to catch up.
***
and yes, stress can affect the way you bm!!!!! any type of stress for me, whether good or bad, and out the regular cycle i go!!!!