[Always *]

Yep, probably just stress, you can be way more stressed then you think too, like when I moved to start college my period ended up being like 2 weeks late and yeah, sure, I was stressed out but it didn't seem any better or worse than anything else that stressed me out before this event or, heck, even after it but it was that one thing that made it late.

It's weird that your body does that cause I've been stressed out A LOT since then and never had my period late cause of it but I guess that what matters is what that special thing that's able to trigger some kind of alert.