Very confused clearblue digital opk

So I'm new to this and we are trying to conceive our 2nd. Our 1st was a total surprise. So here is my issue my cycle is 26 days on the dot. I started doing the opk on cd 6 and i got a negative (no smily) that day and cd 7 but on cd 8 to today (cd 15) a total of 8 days i have gotten high fertility (blinking smily) is this normal and has this happened to any other women trying to conceive? Am i just not ovulating or ovulating late? Oh and i did call clear blue and they said i could have up to 5 days of high fertility (blinking smily) but I'm confused on this whole thing. Thank you for any input you ladies have.