PLEASE HELP!!!! How many days past ovulation am I??

Erin • 💍 9/7/15 💜 Mommy to 2 angels👼🏼👼🏼 and our 🌈👶10/22/19

I'm brand new to all of this. This is mine and my husbands first time trying. I got a positive OPK last Monday and Tuesday (8/28 and 8/29) and of course we did the deed but now I'm going crazy wanting to test asap. I know I need to wait at least 9dpo but when exactly is that??? Please help a poor newbie out.