Blood streak in EWCM

ca

Can a once off small streak of blood in cm indicate ovulation?? I also had a stitch feeling in pelvic area. This only happened once on CD15.

I’ve been using OPKs they seriously just all look so similar. Also not happy with the brand so I’ve changed. I’ve also been temping but I am an open mouth sleeper and also wake many times during the night so they would not be accurate.