I'm 20 week, and I stooled a greenish feaces with mucus in it 2-3times…

I'm 20 week, and I stooled a greenish feaces with mucus in it 2-3times, a day after I stooled but not greenish and my stomach makes noise abit and now my anus is just doing me as if I want to stool again . Hope is not something to worry about? Thanks