15 DPO af late bfn anyone ever got a late bfp?

boymum

So I track my af with 2 different apps I know I ovulated on the 28th or 29th based off my bbt and my CM one of my apps is saying I’m 3 days late glow says I’m 1 day late, I feel queasy but not full blown morning sickness just my stomach turning and almost like a mix of a coming down with a cold? I took a test today it wasn’t with FMU it was very negative I’m at a loss I don’t know if my cycle is just off or maybe I’m not getting my positive yet..