I'm 38 1/2 now, and have racked up three losses in under six months ttc #1. An MMC in April, an ectopic in June, and now, due to declining hcg, am facing an early miscarriage again. I'm at 5+3 today and not bleeding yet, but have lost all symptoms and am getting barely there positives (that deffo aren't the hook effect as I never got a test as dark as the control anyway), so it's just a matter of time.
I'm starting to realise that it might not happen for me. The main thing I'm feeling atm is guilt, and a huge sadness for my partner, who would make a wonderful father. He's 37, and though he's completely supportive and keen to let me know that I'm his only future, kids or no, I'm afraid of what this might mean for our relationship down the line.
We conceive easily together (currently 3 for 3) but it seems that I can't get past the first trimester (I did once, in my mid-twenties and had to terminate so I know I used to be able to). I'm under the care of the recurrent miscarriage clinic and have come back negative for blood clotting and immune disorders. I was thyroid tested a while back and that was fine. I'm currently taking 400mg progesterone nightly and don't really know what more they will do for me given I can get pregnant just fine. It seems like I'm just old. 
Has anyone else had to face up to this reality? How did/are you handling it, particularly as it relates to your relationship?