Miscarriage at 18 weeks.

2 days ago I delivered my beautiful baby boy at 20 weeks pregnant. I went in for my 20 week anatomy scan and saw my baby measuring 15 weeks I immediately knew something was not right, I was told after that I have had a miscarriage. I could not believe it. Before this pregnancy I had 2 early miscarriages. Then upon getting pregnant everything was terrible in the beginning, very slow and low rising numbers and at my last blood draw I was talked about this being an ectopic pregnancy, after that draw my numbers went up! I had no issues. I went in for a regular check up at 18 weeks and the nurse practitioner was unable to find the heartbeat, but she did a mini ultrasound and we saw it. I'll never forget seeing my babys heart beat for the last time. Upon delivery, as of now my doctor believes I had stings in my amniotic sac and that is what caused this to happen. I could see where the strings got wrapped. Im still in shock. I cant believe this actually happened. I got my call today for his cremation and everything just started to sink in, my baby isnt in NICU hes in heaven. I wont be able to show him all the memories from his delivery, all the things I got to honor him. My heart is just numb and broken. Has anyone had to deal with a loss this late ? How did you get through it ?