Second trimester loss is unlikely to be progesterone related, sometimes immune issues may cause that esp if it happened to you recurrently.
so what kind of immune problems?
APA, ANA, MTHFR, NK or Th1/Th2 abnormalities, ... There are lots of possibilities. This is a good read to start your inquiry - http://www.babyfriendlybook.com/.
I also have had 3 miscarriages, but all mine occurred around 8 weeks. I had a DNC on for my 3rd and they did testing on it after and It was caused by something called Triploidy 69. When the sperm fertilized the egg, the egg was suppost to split into 2 (twins maybe) and it didn't split so the baby had 2 sets of chromosones from me, and one set from the father... There are different types of Triploidy. I would talk to your doctor, and get as many tests done as possible, before, during and after pregnancy. It has been 2 years since my last miscarriage and we are just now starting again. Good luck to you!!
thanks I will be looking that up
Thanks for your comment I will also be looking into that too. Good luck to you and im sending baby duct your way. I'm also ttc now so best of luck to the bothof us! <3