OPK confusion!

Bit of back story! 16 months PP, a year since I stopped exclusively pumping, periods came back around 5 months pp!

Son took 3 years to conceive with 3 miscarriages but no real reason as to why!

Healthy pregnancy? Carried to 40+5 and had Induction but all went smoothly.

Not been on contraception since and been taking vitamins on and off but have strictly taken them properly since November! Periods can sometimes be 2/3 days early or late but never massively out of sorts, cycles are between 28-32 days long, I used to be like clockwork and always got positive OPKs around the same time, this is my first month trying to track and confused because I don’t feel as though I’ve gotten a positive opk yet? I have been taking ovulation tests morning and evening since cycle day 12 to try and catch my peak! Yesterday I took 3 as I thought I was hitting peak but it then went fainter again this morning and then it’s gone darker again?

Any advise for anyone who’s been through similar?