First time ovulation strips

This is my first time trying the strips because i am SUPER impatient and doctors don’t take the time to explain how anything works anymore.

I am about to begin my period in like two days (hopefully not.) My normal cycle length is about 28-29 days. Should i start testing the strips right when i end my period? And what is determined to be “the end” because sometimes i will spot lightly towards the end of my period. Should i try as soon as my blood flow is as light as spotting or should i wait until there is absolutely no bleeding?