Clearblue advanced ovulation help?! Please help!

cassie • Police wife 💙 🤰🏼👼👼

Weve been TTC for a little over a year. I had used standard opk but my dr suggested clearblue advanced digital for a better result. Last month was my first month using it. It was showing high fertility on CD9 and peak/ovulation on CD13. This month I am on CD12 and still showing low on the test. Is this normal for it to vary like this? Please help!