no positive on my OPK!

Kelly • kel - 26 - 🇦🇺 - 🤰🏻
Hi guys! 
It's my first month actively TTC and according to my glow calendar I am in my fertile week with a peak on Friday (so tomorrow as I'm in Australia!) but I'm still getting an empty circle on my OPK as I have been all week! is it normally on the peak day you get the smiley? I'm using clear blue digital if that helps xx