I know mine changes from clear to yellowish. I've lost pieces over the last week and it started clear, now it's yellowish/green and very thick/stringy. I called my doctor to be sure it didn't sound like an infection or anything and she said it's very normal to have that color! It varies I guess!
Thank you! I thought maybe it wasn't normal.
No! Does not have to have blood. Can be clear or have a yellow/green color.