Opk to see if your pregnant theory

So I always wanted to test out this theory about how some women say you use an opk to see if you’re pregnant or not, if you didn’t have any pregnancy tests on hand at the time but had opks . I am six weeks pregnant and I wanted to test out the theory to see if it was true. Below is my photo. For myself I must say it is true. Although I wouldn’t know for sure if it would show as much as it is right now right after a missed period, which would be 4 weeks versus 6 weeks. My line is very dark, it showed up instantly even before the control line showed up.

Side note - I’m not saying you should do this. But I just wanted to see if this theory had any truth to it. So I thought I’d share my results.