Mucus in stool???? Super gross but worried

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So I'm on antibiotic for a tooth. I'm 26 weeks and yeah I guess I've been constipated off and on. But today I've been pooping mucus. Like light brownish/yellow. I, of course, can only assume I'm dying lol I've gone to the bathroom and it's been ok but the mucus is worrying me, it's been happening a few hours now. Could it be the antibiotic? Or is it a pregnancy thing lol I plan on asking my dr but its 11pm here and I dont think it's an emergency. anyone have this going on??