Has anyone’s period been late when counting DPO?

Daisy

My period always comes 14/15 DPO no matter how long my cycle is. Does anyone else track their period this way?

My period is now 3 days late (17DPO/CD30) and no BFP

Update: I would assume I had a nonviable pregnancy. CD32 I got the faintest positive test. Then 30 mins later I started bleeding :/