Miscarried, what is this? GRAPHIC PHOTO

Kate

I was supposed to be 12 weeks on 12/5. on 12/4 I started bleeding and went to the ER. Baby stopped growing at 8.5 weeks. I was in the hospital on 12/7 where I was told I passed the baby natut ally. they did an ultrasound to see if I needed a d&c.; they said that I passed everything and would not need one. 3 days later, I went to the bathroom and passed this sac. my ultrasound was clear! what is this???