Premom OPK kit help

Tiffany • Married & a dog momma with one angel baby, ttc baby #1

I bought the premom OPK test kit from amazon and it’s giving me mixed answers about my percentage. I’m on cycle day 12 out of 29 and im spotting (is that normal/ mean ovulation ?) but my opk is at one point saying I’m at 0.28 and then the next it’s saying 0.2 ? I don’t understand. Anyone that can help with this it would be much appreciated !!