Help!

Brandie • I am a 33yo married mommy to a beautifully energetic toddler.
So I don't think I'm understanding opks.. I got that solid smilie Thursday. I tried to retest yesterday but the smilie apparently stays on the screen for 2 days so I couldn't use CB. I was reading on CB website that they say the peak days are the day before and the day of o. So does that mean I ovulated yesterday?