My fertile week

I am in my fertile week. I started ovulation testing about a day before my fertile time was supposed to begin. I had two lines on every test,although it was still negative cus it wasn't as dark or darker than the control line... up until today. My test line had faded significantly, it's almost non-existent, and ov isn't due until the 24th. I don't know what this means and I'm beginning to worry that I won't ovulate at all! Any experiences or knowledge of what might be happening would be really appareciated!