Disappearing positive?

Brittany • 31 husband is 29 married August 2015 together 7 years. Mommy of two boys one 5 and second is 20months!

I took this test yesterday and it seemed to be obviously positive, but it faded within like 5 min... I know I put too much urine on the test, but not sure if that matters. I have never had this happen before. Any ideas why this would happen? The first two were 2-5 min after starting the test and the last one was outside the 10 min mark!