CB OPK help please! Low to Peak?

I'm on my first cycle after a MC. I took a ClearBlue Digital opk test yesterday and got the "low" (empty circle). This morning, I got the solid (non-flashing) smiley face which means "peak." 
   
Wasn't I supposed to get some "high" days in between before the "peak"? What does it mean to go straight from low to peak in 24 hours? Am I messed up?