Scared and worried

Has anyone ever had mucus in their stool? I'm 22 weeks pregnant and I've been noticing mucus off and on in my stool. I have s doctors appointment tomorrow so I have to wait to check if any things wrong. I have been crying all day. Called my hospital, was told that they were going to call me but never did. Should I go to the ER? Had this ever happen to anyone? I've been reading a lot online, they were talking about how dangerous it can be. Just wanna know if anybody experienced this before or heads about it. I would post a pic but don't want (TMI).