Ultrasound Ovulation

I had a transvaginal ultrasound and the doctor informed me that i will ovulate in 5 days. So on the 4th day I took a ovulation test strips just to double check and it was peak.

I was pretty sure I ovulated at that point. Now 4dpo I’m experiencing thick egg white discharge out of nowhere and it’s been lasting all day/night.

Could the ultrasound and OV test be wrong?