OPK's and still getting line on CD 26


I ovulated on Nov. 25th (10 days ago) and I took an OPK last night. I still have a line. It wasn’t as dark as the positive line was, but almost. I do the digi OPK’s but last night I didn’t put it in the monitor, I just peed on the stick, so I don’t know if it would have smiled or not. Anyway, what does this mean when I still have a line? I really think it is too early to test even though AF is due in 2 days. I ovulated on CD 17. Does this make a difference in when I ovulated, depending on when I take my test?