YES, Stress affects our periods a LOT! Don't worry too much. If you're stressed already about other things, don't stress about the period. It will only complicate things more, been there, done that, MANY TIMES.
I got my period in the beginning of February and then in the beginning of March and then I got my period again 2 weeks later. Why could this be? My periods are always regular, except lately I have been particularly stressed...could this be the reason?