Rosa, If your opk's have only had a feint second line what makes you think you ovulated last night???? Did you notice some mucous changes? If so and you only had a feint second line I would say ovulation is yet to come.

Some women don't get a true positive but generally those women will get a very dark second line that is almost a positive... I would continue to test - ensuring you dont' empty yuor bladder for 4 hours prior to the test and try and test at the same time each day (around 2pm is optimal.)