Am I still in with a chance ?

I normally have 24-28 day cycle. I’m on cd 27 at the moment. I’ve been testing since cd 24 and have had bfns everytime.

I’ve been feeling v slightly nauseous but ridiculously hungry at the same time. I’ve eaten so much in the last few days or so! I put it down to xmas pigging out lol I’ve also been weeing more than usual.

But yesterday I really felt pregnant, the same early feeling in my uterus that I felt with my son. Today though, I was sure af was coming as I felt a dull ache . Still nothing ; no af and bfn.

If I was pregnant, would the early tests (frer and cassanovum) they measure 10mlu have shown a positive by now? I don’t know when I ovulated but on cd 20 I had lots of creamy discharge (sorry for tmi)- I thought it was too late in my cycle to have ovulated on that day.

What do you ladies think ?

UPDATE: still no af. Do any of you have any experience of people getting bfns and then getting a bfp late (after af due date)?