Ovulation kits

Brandie
Just wondering at what point do you start using ovulation tests. Do i only do it the week my glow calendar says I'm ovulating or should i start a certain amount of days after af..... been ttc for 7 months ..went to the dr amd she advised me to try these and make sure I'm ovulating. Thanks in advance:) baby dust to all ttc...its been a hard road here. ...