TMI picture (is this my plug or cervical mucus?)

I called my OB and the nurse called me back and says it can be cervical mucus or my plug... not sure which one at this point. That in the paper is only some , l had way more in the wipes before it. It's so dry that it's like slime.. it's not wet mucus... I'm 38 weeks tomorrow.. is it my plug or cervical mucus ?