Positive OPK after time limit?

[BMWL]

I'm currently CD15 and did the first OPK at 4pm (first pic) and then I looked at it 30 mins later and got the second pic.
Anyone have any experience of this? Which would should I go with?

Thank you x

I've also just taken this test and read within the time frame and think it's positive

Mine always do this, I never look at it until about 30 mins later.
On the instructions they say test results after 30 mins can be disregarded so think it's normal they just develop better when drying

Mine always do this too, there’s usually almost nothing in the first 5 mins or so. So like pp said, I always tend to check it like half an hour later. Mine can go from completely blank to full on positive a bit later

A positive opk needs to be the same or darker than the control lineto be positive. So keep testing and hopefully it will get darker soon 🤞

Thank you for your replies.
I'll take it that I'm close to my peak, so DTD today tomorrow and Wednesday should cover the most fertile period I think?
X

If you have a regular cycle I'd say you're close and probably covering your bases x

I've done another one today and it was dark again, slightly darker than yesterday. Unsure whether it can get much darker than that. Should I stop testing now?x

Sounds like O is on its way in the next 24 hours, so if you DTD yesterday and today you should be covered