Clear blue advanced digital ovulation tests??

Brianna • Mommy to a girl born 9/12/2008.😇 10/26/18. MMC 5/20/19 🤰🏼 🌈 due in April 2020!

Has anyone used the clear blue digital advanced ovulation tests? I’m only on cd12 first cycle after my d&c. I know it says fmu so I did that but got a blank circle. I then decided to test around 4pm and got a flashing smile. Would that be correct? I know it’s not peak yet since it’s not a solid smile but does afternoon urine make any difference with it? Just trying to figure out when I’ll ovulate this month.