I need your help ladies!!! Ps advice on the clearblue digital advance kit!

This is the second month using Clearblue advance. Last month I had 9 days of consecutive blinking smiley face and we bd every other day. I didn’t see any peak day. Maybe I didn’t ovulate? But I also read on the internet that it’s best to test in the afternoon and not the first pee in the am. This month I am testing it in the afternoon but not at the exact time( my schedule at work changes so it has been very hard to do the afternoons) anyhow, I am on CD 15 and I keep getting blinking smiley face. We have been ttc since January but just 3 months ago since we are ttc with the ovulation kit. I really need to know from your experience what is the best time to test and don’t get a false positive( blinking smiley) ps. I work overnight so my day hrs are a little different. Thank you a bunch. I do need your help. 🙏