Does this sound like a bleeding stomach ulcer?

Hi there,
sorry it’s me again asking a paranoid question.
Lately I’ve noticed that my poops are really dark dark brown, i have been taking pepso bismal and i know this affects it but it was also before that ( i was taking tums… like 10 a day) does anyone know if this could be why my poop is so dark, or could it be internal bleeding?
It’s a holiday here till Monday, I do have terrible heart burn but havn’t had it over the last couple of days and i’m assuming if you’re bleeding internally you might have more pain than just dark poop?

anyone know?
thankyou!