warning might be tmi

I am 8 weeks pp and I thought I had started my period. I was cramping really bad and bleeding although it was very light not even enough to wear a tampon. So yesterday I go to use the bathroom and I feel this huge thing come out of me. I thought it was a blood clot. It was not. It had blood in it but I have no clue what it is. I called the dr and didn't seem to be too worried over it. What do you ladies this it could be. I have posted a picture.