I'm trying the sperm meets egg plan this cycle, so I've been using OPKs since day 10.  The picture below was taken CD 17; I assumed the line would get darker on CD 18 and 19 but they've been getting lighter.  I always thought I ovulated around CD 14 and 15, but I removed my Mirena IUD in August so my body is probably still readjusting.  My question is: could I still get a positive OPK if this was as dark as it's been all cycle and declined in darkness both days since?  Or am I out for ovulating this month?