16 AND NEED HELP!

Hi everyone, basically for the last 10 hours my stools have been black but with no other symptoms but I am also a little constipated as well. I also have like black mucus to when I'm straining and this has never happened to me before. dark stools have before in the past and it went. I have NO pain in my stomach or anywhere else. Any help is appreciated. I do have IBS as well.

had you taken something like pepto bismol or another product containing bismuth, i know it creates black stool.

thanks for replying. and no I haven’t taken anything. I don’t know what it could be