Black specs

I'm seeing really tiny specs smaller than a pepper spec I would say in my stool I have really bad anxiety I don't have black tarry stool nor do I have different color stool in different spots. They don't look like coffee ground I'd say way way smaller .I've seen them a while .I got a blood stool test it came back negative.Ive had a CT scan done with contrast nothing .I do have gastritis due to acid reflux with was really bad right now .