Ovulation?

Lucy
I do not get this ovulation thing.
I got my implant out in May so my husband and I could try for a baby. I bought ClearBlue Digital Ovulation test kit and when glow said I was at peak ovulation, I was only high ovulation on the test. 
Once Glow said I was ovulating and so did the test but right in the middle of ovulation I started my period when I wasn't due on.
I'm so confused as to when I should be ovulating, could it be the implant that's messed with me? 
How long does it take to get back to normal?