When should I begin testing?

Meagan
I finished my first cycle of clomid on Sunday, glow says my fertile window begins tomorrow and my obgyn said to start BDing 5 days after my last clomid pill which would be Friday. My fiance and I started BDing last night, we don't want to take any chances of missing my ovulation. I bought a 20pc of opk test strips today, when should I begin testing??