2 positive OPKs

Erin • Married ❤️ Mommy to Ava Noelle 11/17/17 💜
So the top pic is my OPK from today CD 14. Bottom pic (which seems a tiny bit darker) was from yesterday. Getting 2 days of positives has happened to me once before but I'm just wondering if this happens to anyone else? I've been mildly crampy since yesterday AM and have watery discharge. Does anyone know why it does this or how I can predict when I'll ovulate? 😕