WARNING:: TMI for certain reader but need help

I'm 18 weeks and 4 days and for the last week or two weeks my stool has been either bright green or dark green. Sometimes constipation and sometimes diahera. Most of the time when I wipe there will be green looking slime(only way I know to explain it) 
I googled it and it told me not to worry but I am. It says could be from hormones or pretnatals. I've been taking my prenatals since 7 weeks though so I would think I'd done this before if it was them. I'm just afraid it could be something else. Thoughts?