Ovulation testing?

Madison

So, this is my first time trying ovulation testing and of course I'm very excited/anxious to get a positive result and to see some dark lines. This week starting last Saturday is supposed to be my ovulation week and my high day should be Wednesday. But the lines on my test just aren't getting darker. Making me lose hope that the tests actually work. When do they start getting darker? Any advice on ovulation testing is much appreciated!