Post Cervix Check Spotting or Losing Mucus plug?

Des
Hey! I had my cervix checked yesterday at my 37+2 appointment. My doctor said spotting is very normal. 
I have been spotting brown sticky Mucus since yesterday. I was dialated to a 1 and 70% effaced. How do you know if it's the Mucus plug or just spotting? Does it even really matter? 
I am having Braxton Hicks, but not regularly. 
Thanks for the input!