Ovulation sticks

I’ve just started using the opk sticks this cycle awaiting for the smiley face, I’ve read the instructions on the packaging and it says not to test your first morning stream urine and not to test within 4 hours of urinating. My question is does it matter if you test first thing or if you test within the 4 hours? Thank you

Waiting 4 hours to pee on a stick is challenging 😂