strip a little darker cd18

So yesterday finally my ovulation strip got a little darker on cd18 it's very close to ovulation but not 100% I was cramping pretty much all day yesterday, I tested few times yesterday and they were all coming negative until last night around 11pm it came very close to positive and after few hours I checked and the strips are all coming negative again so I'm so confused :| if I did ovulate or the strip was just defective .. usually my ovulation strip comes positive for sometime before going negative .. clomid really just wierd tricks on me 🤦🏻‍♀️