TMI!!! Please help


So I delivered my daughter on August 15

On October 7 I got my first birth control shot.. and am currently on my period for about 16 days , mind you it is light. Well today I went to the restroom because I had to go pee and as I’m going pee I felt something come out of me and heard something fall and look down. And got it out of the toilet with a plastic knife and spoon.

& his came out of me?! It’s a about 2 inches wide and about 4 inches long. It’s not round. It’s very thick. It looks like tissue it’s purplish with veins almost looks like intestines? What do you think it is?!!! I have a feeling it’s leftover placenta...? I’m going to urgent care later on today. Nurse over the phone told me to save it