Confused on opk results!

Jen • Mommy to a 7 year old boy and 4 month old twin boys!
So I have received negative opks for the last 5 days with the clear blue digital and now this morning it was peak fertility (solid smiley) and I didn't even have any of the high fertility (blinking smiley) leading up to it. I pulled out the test strip from it and it's def positive. Has anyone who used these went straight to peak fertility and had no high fertility before? Thanks for the help ladies!