Positive opk/ewcm....twice this month?!?

Ha

Hey ladies. Gotta say, I’m so confused this month. I have 31 day cycles and ovulate every month on cd 18-20. This month I had my normal ewcm two days before my positive opk (like really positive opk haha). 1-3dpo my opk were definitely negative. At 4dpo I got more ewcm, but didn’t think anything of it. Then I got a whole lot more on 5dpo, so I took another opk just for the heck of it....super super dark positive. This has never happened to me and we’ve been ttc for just under a year. What in the world?! Anyone have any insight?? Figuring I just didn’t actually ovulate the first time?