ewcm AFTER ovulation? HUH?

Have you gotten ewcm after confirmed ovulation? Confirmed O through a sustained temp rise with bbt charting. I never notice it like EVER and I saw it at 3dpo for the first time ever. We haven't bd'ed recently so it's not sperm. 
What could this mean? 
Secondary estrogen surge? 
Pregnancy?
Just some fluke random thing?