Does your mucus plug necessarily have to be green? Yesterday after sex I bled a little bit, it was…

Does your mucus plug necessarily have to be green? Yesterday after sex I bled a little bit, it was light pink. But then it went away for the rest of the day/night. Right now I went to the bathroom & had some thicker discharge that was light pink. Wonder if it's part of my mucus plug or just left over from yesterday?