What's the difference between mucus plug and bloody show?

Cara • Baby girl due December 15th!💜 Have a 2 year old son, my world💙💜 & an amazing fiancé💏
Hi can anyone help! I have been loosing my mucus plug over 2 weeks been in and out of hospital, had steroid injections at the ready (as I'm only 31 weeks) now lastnight I had a heavy 'bloody show' same as the mucus plug but lots of blood in it and it's all brown? What are the differences between the both? Is one an indicator and the other not?