Pulling from control line?


Hi! I took a clearblue digital ovulation test today and it’s my 3rd day in a row with a solid smiley face. I took my other ovulation tests and it has an extremely dark test line and the control line is more faint. I’ve never had this happen before? Is it invalid or am I just in my LH surge for the 3rd day? Does anyone else have a surge for 3 days?