What Causes Dark Oil Droplets In Bowels?

Hi,
I have a question about dark oil droplets in stool. I had a sudden pain in my stomach, so I went to the restroom and I passed stool that felt normal, and looked nothing out of the ordinary but I noticed many small drops of a dark oil like liquid (I say oily because it looks kind of dense, and it floats on top of the water in the toilet bowl). Worried, I searched for similar symptoms but all I could find was orange oil droplets but not dark greenish ones. Is that a sign of a serious problem? Should I see a doctor immediately?

Thanks