How to read ovulation tests

Re

I'm new to <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> so I'm not too sure how it works. I got a pretty dark line this morning, and a slightly darker one a few hours later. I know neither are positive yet, but if I keep testing I should get a positive later today, right?

This morning

Just now