What is this?

As you can tell I'm new! Recently I found a small yellow string in my stool, I broke up my stool and that is how I found it accidentally. It was small and kinda hard to break apart but I broke it up in small pieces and didn't think anything of it and threw it out. but now I'm worried that it was a parasites. I went through the trash and found the remains of it and pulled it out to take a picture, it dried up but what dose it look like!