Any advice?

So we had sex 3-4 days before I was supposed to ovulate, didn’t use protection so I took a plan b to be safe. I am over 220lbs and just learned that if you weigh that much plan be might not work. But could I still be pregnant even if we didn’t have sex on a day I was ovulating? Or is the plan b weight limit a real thing? I just need a little guidance. Too a test today at 6 dpi and this is what it looked like. Any advice appreciated.