High Fertility After Miscarriage

Hi! I experienced a miscarriage on 7/18. One week later on 7/25, my hCG was down to 16 and I was given the go ahead to start trying again. I started to use ClearBlue Advanced Digital Ovulation Predictor Kit the next morning, 7/26, and received the open circle representing low fertility. The next morning and each morning since I’ve received a blinking smiley face. 

I wanted to reach out with 2 questions:

1- What is the likelihood that this is a false positive?

2- Would the reader ever go back from a blinking smiley to an open circle in the same cycle?

Thank you!