Ovulation-two blue lines

So I just took my first ovulation test today and it said I had low fertility but when I ejected the test strip out the strip had two blue lines. One was dark the other was almost as dark but still lighter. What do the lines mean? I looked it up and from what I could gather it seems to be picking up on hormones? Who has had the dark line and lighter sign and what did it mean when you had it?