when should I start testing??

Taylor
This is our first cycle ttc and <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> so we're constantly researching questions lol! According to my chart af is due on 2/9 this month...during my fertile window I was opk testing almost every day, the line was faint my entire window and I tested opk positive Monday morning and late afternoon so I am assuming I ovulated Monday. Could have been before because I forgot to test Sunday 😕. If I count Monday as my ovulation day, af starting the 9th would only put me at I think 8dpo. I know some early pregnancy tests can detect 4 or 5 days before your missed period but isn't 8dpo already too early so testing even earlier wouldn't even come up at all?? Advice on when I should start testing!? Praying for a bfp!!! 💜