Negative Ovulation Tests

Ma

My husband and I have been TTC for about 5 months now. This is my first month using an ovulation test. I am using the Clearblue Advanced and they have all been negative for the past 7 days. Is this normal? I figured I would at least get the flashy smiley (high) by now, but every single one has been negative. Feeling discouraged that maybe I'm just not working properly. Any advice will help!