Ovulation tests action

Hi ladies,

We've been trying to get pregnant since February. I did some ovulation tests from Action this week, always at the same time. Friday, Saturday, and Sunday had a very faint line, Monday was darker, and Tuesday evening it was lighter again. I felt my egg on Tuesday morning (like period pain on the right side).

Has anyone else experienced that the test line doesn't get very dark but still ovulated?

Thanks in advance, ladies.
Love, Jamie