Clearblue advanced opks

[imaginary8x]

So I have two testers I used my main one this month and I got a solid smiley face right away. :s so I tested with the other tester with the same urine that gave me a solid smiley face and it came back with it being negative so after that I used the 2nd tester the next day and got a flashing smiley face and I've been getting that for the last 4 days now.

Do I go with the main one or the 2nd one?