Hi I don't know lots on the subject cause it is quite hard to get answers and facts

I have a short cycle a bit like your slef and my losses have been put down to that fact that the embryo does'nt have time to implant properly. Although I did have 3 children and 3 losses before my last baby..None of my babies have ever been tested, none offered??? majorty of my losses were before I came to BB so I had no idea.. after my 4th loss I started to look for answers and went to see a series of FS.. we had a lot of testing done none showing any problems!!! So with help from my FS my cycle was lengthend out to a 28day cycle and I finally fell pregnant, I was put on progesterone pessaries which I used till 14 weeks, I still had spotting/bleeding which is something that has happened in all my pregnancies, but the baby stayed.

I recently fell BFP unexpectedly and without the care of an OB until 8 weeks decided to get my GP to moniter all my levels, they all were rising nicely, then one day I got some very slight spotting , I went to get my levels tested to find that my HCG was going up really well but my progesterone had dropped... only a bit... but a problem.. over the next 2 days my levels dropped nearly in half, bleeding increased. I went to ED and after a lot of issues and being very determined was finally prescribed progesterone pessaries, I then drove to Melb to fill my script and used one while sitting in the car We have'nt looked back my levels started rising again bleeding lessesn, is now discolouration. Just had another US baby is a bit over 10 weeks great HB very active and looking good, I feel safe and the baby looks so good I can't imagine that he/she won't make it.. My OB, has told me the jury is out on progesterone, but was happy to give me another script as it also does no harm and I will continue to use it till 14 weeks like last time..
Unlike the OB and docs I have no doubt..... I believe progesterone works

Best advice I can give, is be determined, doctors often don't have the answers ...they don't have the vested interest you do in your baby, trust your instincts read everything you can get your hands on and if you feel it might help use the pessaries, get them..they don't do any harm..

Best of luck, I hope you find the answers you need.