Normal poop or call the dr?

I have a poop question. My LO is a week and a half old and most of his diaper looked normal but it had chunks/spots of black in it. I read it could be from digested blood, like if my nipples were bleeding, which they aren’t. He hasn’t had meconium poops in almost a week. I don’t remember this with my first kiddo, just curious if it’s normal or if I should contact his ped on Monday? Happy to post a photo in the comments or something. Just didn’t want to post a poo pic on the main post. Thanks!