Multiple (like 8 days) worth of high surge on OPK...

So this is my first time tracking my ovulation and bbt...so I'm new to this. But I have had 8 days of flashing smiley faces as of today. Idk what to take of that. Anyone else have this? It's even out of the green fertile window this app has predicted for me (yes I know it's just an app but still). I'm just curious to see what happened after this happened to other ladies. Thank you!