41weeks pregnant

First time mom, and I'm at my 41week of pregnancy di pa lumalabas si baby nahpa check up ako yung sabe normal lang daw na d pa lumabas kasi first baby. Pero just now may lumabas na parang light brown sa ano ko. Hindi naman sya yung normal discharge ko kasi yellowish yung normal discharge ko. Pa help po momshies, is it mucus plug or what?