No period/delayed period

I’m like 99.9999% that I am not pregnant,

And I’ve never had unprotected sex

however my period is late by 6 days

I had sex (protected) on the 3rd late day of my period,

I just got a new job which has recently increased my physical activity and stress

I’ve gotten my period symptoms (6 days ago) and I’ve had them since but no blood.

I don’t know what this means, is this normal

Could I actually be pregnant? Or is there other logical reasonings as to why I am delayed or missed? I’m freaking out.

I’ve never been so late before

I just want to know why