When to test ovulation?

Michaela • Christian, wife, sister, and aunt! I am pregnant with our first baby and... It's a girl! 💖 Norah Ruth is set to arrive in May 2018!

Hey! This is technically our first month of TTC and I'm trying to use an OPK. My app says today is day 1 of the FW, so should I use the OPK now or wait a day or 2? Has this really worked for any of you?