First Response OPK - would you consider this positive?

Hi ladies! Been TTC since Nov. 2015. I use the CB Advanced Digital OPKs with FMU but have had 5 straight days of "high" fertility (flashing smiley) and no peak yet. No BBT spike yet either. To double check, I just started using First Response OPKs in the afternoons to make sure I don't miss it. Below is today's (CD15) result. How much darker do you generally see the test line get? It's pretty close to the control line, but I'm not sure if it's dark enough to count as "positive". Thanks in advance for your help!!