Creamy cm but opk neg?!?!

Renae β€’ πŸ’™ '09....πŸ’™ '11....πŸ’” '14.... πŸ’” '14....πŸ’” '15....πŸ’” '16....πŸ’” '17....πŸ’œ 12/12/17
Ive just noticed that I have what looks like creamy/yellowy cm yet the opk test I took last night was neg! I'm pretty confused as it says that I get the creamy/yellowy cm after u ovulate! Should I retake a opk test now even though I took it at 6pm last night?????