Clomid and OPK's!

Hi everyone.
I have PCOS and this is our first round of clomid. I am on day 13 of my cycle. 
Today I have had one negative opk (Answer Brand) and another that showed the smiley face (clear blue) which means positive. When I took the stick out of the applicator thing, the line is barely visible like the other ovulation test I took, which looks negative. 
Which is accurate? Negative test or smiley face?