Opk digital clear blue

Has anyone used clear blue advanced digital?  I am not sure how much I should trust it so I wanted to ask opinions.  I started using it last week 8 days after the first day of my period.  I got a negative, high, high and peak on Wednesday.  I stopped using like it said since I got the peak but was still curious because I had no ovulation symptoms at all (there was some stretchy egg white discharge but it was not clear-so odd)....   While I was testing with these I was also using an off brand and it never got a positive result.  I ran out of those but still had some extra of the digital.  I used one yesterday (not first urine) and it was high.  I used again today after feeling slight cramps and it was peak (also not first urine).  My cervical fluid was clear and watery today. My cervix is high, firm and closed.  I am so confused.  Could it be that the test just is giving me false positives bc I am using it after I got the first peak or not first urine? Or could this be a sign of me being pregnant?  I didn't know if it would give that result.