I am so sorry you are going through this. It really sucks that there is no real information on what happens and little support for your emotional pain afterwards. Just know that your feelings are normal and it WILL get better.
I have had a natural miscarriage at similar weeks to you. It started with spotting for me. Went for scan to be told no heartbeat but hospital dragged it out until I was over 12 weeks which was why I believe things went the way they did.
MY EXPERIENCE IN NSFW DETAIL BELOW - TRIGGER WARNING
I had contractions. Started early in day around 9am and lasted until early next morning. I went for a bath and napped most of the day as the pain got worse.
I didn't know what they were and around 8pm that night they were closer together in time and it felt like I was getting stabbed and the knife twisted for 20 seconds and then no pain so went to A&E after calling NHS24 only to be left to it. By 10pm my waters burst (all over me and the waiting room floor) and chunks/slivers of uteral lining were passed. This was a good thing, the bigger the tissue, the better as you want it all out as quickly as possible.
There were more contractions coming in slow waves. Each one hurt but I was fine in between. They stopped around 1am and I passed more lining before being let home. I do remember I stopped bleeding (it was light anyway) and I passed the fetus around 2am at home. I knew what had happened due to size and shape. There was nothing recognisable as a fetus or baby though which I am extremely grateful for. They give you a leaflet advising you to flush and something about your 'baby' being out at sea? I don't remember it well but I do remember we read that leaflet and it was so absurd and flowery we laughed. You may find yourself shaking your head at some of the information and leaflets you are given too.
After that, there were no more contractions and very little tissue coming out. It was like end of a period cycle and then a normal period.
I had to go to hospital for a scan to check if anything was left and was giving tablets and antibiotic to get anything that was left out. It was surreal to be honest.
Unless you are bleeding heavily and something is wrong, NHS 24 suggest you stay home and allow your body to do it's work. I wish I had stayed home but I never expected actual contractions! I thought it was supposed to be period cramps.
The experience was draining but I had my partner for support and we tried to use humour to make it less harrowing. I believe that worked for us. I am not traumatised by the experience and the worst for me was the emotional pain afterwards which took me over a year to fully 'get over' although you never truly get over losing a pregnancy that was wanted.
I sincerely would not wish a miscarriage on any woman but hope that my honest account of what happened to me helps you so you know what may occur and you are not left afraid and confused as I was. Hugs and best wishes to you. xx