Why is my period late!! And no I’m not pregnant because I can’t get pregnant anymore. Can working…

Why is my period late!! And no I’m not pregnant because I can’t get pregnant anymore. Can working out change your cycle? I started back at the gym about 4 weeks ago. My period has always been regular down to a day of two of coming. I’m not about 4 days late. I am also under a lot of stress right now as we are making settlement tomorrow for the old house!!! Could it be stress too? Ugh I’m super stressed!! A lot has gone wrong this week and it’s been rough