Constant positive opk??

Me

Hi all. I had 2 days of smiley flashing faces Tuesday and we’d then a peak solid face on Thursday just past. Since then however I’ve had 4 days of flashing smiley faces ‘high fertility’ has anyone else experienced this? Clear blue advances digital ovulation tests. I also used cheapy tests and got positives on Thursday, Friday and Saturday.

Is this normal? Can levels stay high for so long??