Sorry about long posts..on train back from coventry and want to get this down on here whilst its fresh in my mind.
Saw Prof Brosens who again took the time to listen and explain. He discussed again about each uterine lining and each embryo being unique - and the importance of the lining being selective. The key function of tbe lining is to respond to that unique embryo, appropriately. If there are high NK cells, (as I have) it is indicative of the lining having an inflammatory response. Its thought that the inflammatory response is caused by having low levels of stem cells, which makes the lining age too quickly. The uterine scratch activates the stem cells (as well as providing a sample for NK cells)
NK cells are just a snap shot - they change with each cycle, as does the whole of the lining each time. Some lining is left after each menstruation, so each lining has old and new cells, each lining is unique. Which is sort of hopeful as it can'reset' itself. Hence people may have 3 mcs then suddenly a successful pg. The more mc's you have, the higher the liklihood of another, but there is still a chanxe of success due the regeneratative properties of the lining.
In terms of my 9 week loss, which was doing well up until it died (ie no growth retardation, good 'normal' scans) he said: Could have been a chromosomal issue (erpc gave no results so we will never know); or could have been because that is the stage the placenta takes over. Which I know has been discussed on here before. So at 9 ish weeks, the placenta is flooded with blood, oxygen, and free radicals - its like a stress test. If the cells that have formwd the placenta are not properly 'prepped' it may fail with the sudden increase in blood flow. So for me, my lining may have been better this time around to get to 9 weeks looking normal, but still not quite up to it when it came to the placenta.
The plan is to ttc for 2 more cycles on the prog from day 21, pred if bfp and heparin. If I have not conceived in that time (tried 2 months so far post mc) to return for another scratch for its beneficial properties and check NK cells again. Also he would suggest BHCG injections which may be beneficial to the lining (ok to start later from positive pg scan - its not like the prog or steroids which need to be started early). He said the BHCG is totally anecdotal and no scientific evidence it will work, but sometimes you get to a point where its worth trying.
Sorry mammoth post - I left out details I was unsure of as dont want to give incorrect reports.
Got to get off train...