One irregular period

Just checking to see if it’s normal to have extreme stress from work plus new exercise can mess with it? First irregular flow ever had I’m 36 it’s never been on time such as early or late but it started out very very light to point wasn’t sure it engage started then started and I thought was done yesterday and I bled some more. Just started taking Pilates 3 weeks ago and work is putting me under a lot stress for work stuff and emotionally can that extend a cycle?