The las three days my poop has been black and slimy or wet, and not a lot. today i have pain in my stomach.

This could b very: serious.Very dark maroon to black stool that is sticky and foul smelling is internal bleeding until proven otherwise.Of note,Pepto Bismal can cause the stool to look like this.I suggest you go to an Emergency Room or clinic that is open on Sunday and get this checked.You may have active internal bleeding!!

If it is black as: Night, you need to seek a formal evaluation and sooner rather than later. Black poop without use of peptobismal/Keopectate or iron supplements(which can make stool black) suggests gastrointestinal bleeding and that can be serious.

Could be blood?: You need to be seen by a physician to make sure you are not bleeding and if you are why and where? You may have a bleeding ulcer or gastritis.