Did I have a miscarriage????

I hate to diagnose myself on google but this time it was really different. My period came almost a week late a little bit after me and bf took a plan b after an accident (For background information I’m on birth control since then. I’ve also taken a pregnancy test at the hospital and it came back negative). I started spotting yesterday w small cramps and early in the morning today I kept waking up bc of my cramps. Today when I got up my cramps were really bad I was rocking back and fourth. I finally took some pain medication and decided to go to the bathroom and when I pulled down my pants I had a huge blood clot!!!! I’m no stranger to blood clots. It’s not new for me to get them but I’ve never seen a blood clot w mucus likeness or white tissue. So I decided to pick it up and I could barely squeeze or rip it apart...unlike all my other blood clots. It looks like there veins in there. I read online that you can tell if it’s a miscarriage or a blood clot bc blood clots will eventually go away when ran under water. I ran this blood clot under water.......for a while. It’s still here. At some point it stopped shedding blood and I was just running some sac under water. I examined it and I could open it up and put my finger inside! It’s hard to tear. Here are some pictures. I read on google that this could be a blighted ovium. Anybody else had this problem? What do you think happened and what should I do? And btw that’s the sac on the counter after running it under water for a while