UPDATE! 36 week check/Mucus Plug??

Had my 36 week check today 1 cm 50% effaced/thinned just went to the bathroom and had this? I'm pretty sure its mucus plug but I cant remeber from my first.

Baby is measuring a week ahead idk if that matters. Lol

UPDATE: been having what I think are BH. And just lost another chunk of mucus plug! Should I be worried??