Confused..ovulation!

I have been testing twice a day since cycle day 9 (I gave up writing the date on just left them out on the side so I didn't get them mixed up) I am now due af on Sunday (28/8) they started getting darker but then didn't reach as dark as the test line, I have been told I still should have ovulated but looking at these makes me confused! (Also my periods have always been very regular ever 28-29 days) what do you guys think??? 🤔 id say the 8th one from the bottom is the darkest test ??