Opinions please

Olivia

So this is the first time I’ve tested using strips. I have severe PCOS and am very irregular however last two cycles have been bang on 28 days. I usually go between 28-35 days. Would cycle day 18-20 have been my fertile window? They’re never dark results like I’ve seen others have but they’re very visible. Been trying for Four months now. Had 💃 sund, tues, wed and thurs. HELP please! 💕