Parasite?

I have been finding these long brown mucous like objects. A while back 6 months ago I would find familiar objects but they looked mucous like with a very thin brown line running the full length. Now that are longer and thicker. Talked to my doctor he had no idea.
They show up first thing in the morning first bowel movement and first to come out. Have not idea what they are.
Hope someone can help me identify them