Black poop

’ve started having black poop. Is this something concerning I should go see a doc for? If not I’m not going to go but it’s like BLACK BLACK not a dark brown. I use to be on suboxone an would swallow them whole an ik they can cause stomach ulcers but if I’m not at risk of immediate death I don’t want to go so I figured I’d ask here first. Also, I had hep c before so I wasn’t sure if it could’ve been my liver causing it? Idk I’m not a medical professional just would like some opinions. I’m 28F smoke a pack a day smoke weed occasionally recovering fentanyl user 5’6 an 145lbs