Girls who spot with ovulation....

Do you spot before a positive OPK? I have never ever spotted with ovulation, but today I'm seeing some bloody cm. It's CD19, the day I always get my positive, except it was negative and I took it twice

I'm not sure what to make of this. I don't really have much CM to speak of--at least not like other months and I've been taking mucinex. The bloody stuff is long and stringy but not like my typical EWCM.

Any thoughts?