Question mommy friends!

Yesterday I was checked to see if I was dilating yet. My doctor told me I was an that the baby head is really low already. Few hours after when I went to the bathroom I noticed a goo with little blood in it. It's just a little goo at a time an only some times. Is it my mucus plug? I know they said blood will be in with the mucus plug but I didn't know if that was once you completely lost it. To me it seems like I'm only losing little pieces of it so is it normal to have a little blood mixed in? Sorry if this was confusing to understand.