Is this a positive ovulation test?

Ok so, I took this test like 40 minutes ago and waited around for like 2 minutes but the test line was barely there and wasn't getting darker so I left and did a few things and came back like 30 min later and it looks like the test line is darker... Is this accurate though since I waited so long to check it? I checked some of my old strips and the line did not get darker with time.