Opk

Does anyone know what it means when you get a positive opk with both dark lines withing the first 5 min but an hour later your line fades into a lighter color then the reference line? Does that mean its positive or negative? I thought I had a positive 3 days earlier and my temp is somewhat fluctuating, it went from 96.8(day of first + opk), 97.6, 97.2, 97.7 and today 96.9 (day 2 of + opk which faded into a -) .... ps it's not an implantation dip because there was no insemination done by the first +