Bloody show or spotting from cervical check?

ki

I just went to the bathroom and definitely wiped some mucus plug (which has been happening for a few weeks now) and some of it was reddish brown. I had a cervical check yesterday and she always warns that spotting us normal. How can I tell the difference??

I'm 37 weeks now. (had first at 39+3 and 2nd at 38+)