Ovulation Test Advice needed

Advice please.
I've never used ovulation strips before until today. I'm on cycle day 13 so I'm due to ovulate very soon. I know I should have started testing sooner but they only arrived today and I'm to eager to get on with it lol. 
See my test strip pic does this mean I'm due to ovulate or does it need to be darker ? I'm sure a lot of you are experts when it comes to these tests !