How can I go about my case almost lost my life to negligence saying I miscarried a child when I was still very pregnant

Back in May I got pregnant and found out June 18 that same evening I had a small gush of blood so I went to the Er and they said it was a threatening miscarriage and to take it easy and follow up with my doctor to make sure my levels were still rising they were at a 2000 when I left the Er so I reported to my doctor that Monday she ran blood work to check the levels they came back to a 4000 so I was relieve to know they were going up so they gave a ultrasound when I Went back and said there was a sack but no baby and ran more blood work blood work came back to 0 and she diagnosis a miscarriage so from June to August I was super sick vomiting and gain weight I called to tell her my concern about the vomiting she said it could be the hormone still in my body to se my primary care doctor if it continues then I never got a period I called and told her the nurse said just wait it out one August 16 my water broke and was rushed to Er blood pressure at a 60 had to get a d&c and 4 units of blo