OPK? positive?

Just wondering if anyone can help?! I'm on month 2 of TTC and done a ovulation test on Saturday night (see below) I then performed another test on Subday morning and the line was a lot lighter. Does this mean that the surge is likely to have taken place overnight or I have not ovulated as the line is not as dark. Last month the line wasn't particularly dark! Thanks for help and input :) Any will be appreciated.