Hi and welcome to the site you will find heaps of great advice and support here .

I used the home ovulation kit when ttc and had a similar problem in that the line was never as dark. I just assumed that if there was a visible second line then I was ovulating. I also used a Maybe Baby, a small microscope that works on saliva. When you ovulate your saliva takes on a fern like pattern and this can help determine when this happens (can be a bit pricey though). Good luck to both of you and lots of your way.