GI bleed?

I have acid reflux and today I had two bowel movements that were black or very dark brown but I had eatin some Oreos yesterday I'm wondering if this maybe is a bleed or just from what I ate and if it was a bleed would I have other symptoms and what Would they be?

[NayaPixie]

if that was one of the main and only things you ate possibly people with acid reflux if have had to change their diet somethings pass thru us faster tha n normal or just plain funny if your stomach was bleeding chances are you'd be puking up what looked like coffee grounds, has it been like that since? if it prolongs i would get looked at otherwise quit eatin oreos as a midnight stack LOL