Ovulation on AF day

Phebe • From London Essex , married with 4year old son 😍 . Finally got my 🌈👶🏽 due in September 2019 💞

I’m so confused ! First time using a digital ovulation test , I decided to use it as I was having egg white cm the last 3 days & AF is a no show . I honestly thought I ovulated on Christmas Day 🤔! Any one experienced this ? How long do I have to baby dance if I’m got the 🙂. D