As i said before Renee - it sounds like your body is getting used to coming off BCP... Bleeding can change and it can be lighter, heavier, last longer or just spotting until your body gets back into a proper cycle.

Fertile CM is like raw egg white... and when not O'ing it's creamy in colour - when pg you get the same sort of CM you get when your not in your fertile period... It doesn't change to some special secret sort of CM when ya pg - it's just the same old same old. Unless obviously it's show or something which you shouldn't expect till the end of pg anyway...

Daniella - Yellow usually indicates some sort of infection, like a bladder infection or thrush... Especially if you haven't been drinking much or enough water.