Hoping for rainbow baby but is this evap??

I'm so mad at myself because I took this test thinking "oh it's too early but why not". So when 5min hit I had to leave and I didn't take the test with me. I came home and see this. Could have been there before he 10 min mark but could have showed after. In person there is a little more than just that thin part but the camera doesn't pick it up. I was hesitant to call it an evap because of how dark it is and I haven't personally experienced evaps in these before. Anybody have an idea?? We're hoping for our rainbow baby 😁 thanks!