Clearblue opk help!

Ok so I use the Clearblue easy read digital opks. They have a circle if negative and smiley face if positive. I got a smiley face (positive) on cd 10 which is like a week early for me. I was suprised but excited to see it. When I popped the strip out I noticed that there were two lines but it was smudged. It has kind of worried me that maybe that wasn't correct. Had anyone had this happen? Or know if that even matters? Thanks ladies.