BF stool question (picture included)

Britt • 👦🏼💙 May 27, 2016 ;👼🏼 12weeks Nov 2017 ; 🌈 💙🧒🏼March 8, 2020 💖👶🏻 Aug 3, 2021
My 12week old spit up and it was brown. A couple minutes later he spit up some more and it had like a red Mucousy clot in it. I called the doctor and he didn't seem concerned I EBF and he said its most likely from me. It makes sense because I am cracked. I've been pumping the past 24hours but have nursed him a few times. His spit up is back to normal like before so I'm not as concerned about it BUT his last 2 diapers have been really dark stool pretty much adult color. (Picture below). The ped said he thinks it's related. About a half hour ago He had a really dark stool. He's otherwise acting normal and his regular self. Has this happened to anyone else before or has any of your BF babies has stool that looked like this