Black Throw up?

Tonight I drank a few cans (Nelson County blended bourbon and cola) and threw up a bit (happens every now and then when I’m getting on it) and it was just pure liquids cause I haven’t eaten much today. Anyway the last few times I’ve thrown up while drinking it has just been this black and brown liquid because I’ve just been having premixed Bourbon and Cola cans (I don’t like to eat much when I’m drinking) and im curious if that’s normal or if I should see someone