Needing some help/advice

I was supposed to ovulate on the 5th, but Glows changed it twice now to the 6th and 8th, because AF is due today. (Has been a no show, and I’m regular every month)

First tested on the 15th in the AM still got a BFN, and even this morning was a neg. It could have been PMS, but I experienced dizziness, nausea (no vomiting), heighten sense of smell, lower back/leg ache, sore breasts.

This was this mornings photo. (First response test)

If anyone has advice and such that’d be great!!