A bit of advice required please...

My opk have been negative right through my predicted fertile window. However on 24th and 25th Sept the line was a darker negative than other days. Could I have missed the window? Glow has moved my predicted ovulation date back now to 29th Sept, but negatives are fading on opk.

BD on 23rd and 25th Sept, so hoping even if I missed the positive opk we still have a chance to conceive?

Your thoughts appreciated x