Positive OPK?

First month using OPK’s.. I’ve been testing since CD 14. I thought I ovulated early this cycle like day 11-12. My cycles are typically 29-30 days. I’m CD 19 today. I’ve gotten all negative tests but I tested tonight and it’s the darkest line I’ve seen! Do y’all think this is positive? I put it in my app and it said positive. I thought I already ovulated though!!! I’m so confused. Help please!