Late?

I have glow, ovia, and ff apps and they all tell me I should have started yesterday so I took a test this morning and it was negative ... I'm not sure what could be causing this , I do have a uti but I'm very prone to these and have never had it make me late. I don't have any symptoms besides some dizziness , some very slight nausea and I'm sleepy no matter how much I sleep .

I am ttc but I don't feel pregnant or test positive. I'm not stressed either so I'm beyond confused. Has anyone went from a very regular af to not so much without being pregnant?