I'm in a similar situation and waiting to have a medically managed miscarriage over the weekend. I'm 44. We have a 14-year-old and an 11-year-old, but had 3 miscarriages in between. The first was at 5w6d (tracked hcg so knew and it was spontaneous), 2nd at 3w5d, 3rd was quite a late positive and m/c at 5w4d.
The current MMC was sometime just after 6w3d as I saw a heartbeat then, but scan today should have been 9w2d. They said we can fill in forms for genetic testing. My previous pregnancies were always managed between fertility treatment and GP, with second pregnancy on clomid. I think my fertility make-up and patterns are actually the same as they ever were. It's the same 'unexplained' fertility issues I am experiencing, but I feel like they will tell me it is just age and egg quality.
I think what is important once you are pregnant is getting seen by the EPAU if you can self-refer. I tested privately for hcg and progesterone this time as my GP wouldn't. I was able to self-refer to EPAU as had had 3 previous losses, even though they were over 10 years ago so that has made a big difference even though the outcome isn't good this time.
I saw my GP at the start and she also said they can usually refer for recurrent miscarriage. We didn't do this before as the pregnancy with our 11-year-old ended up ok.
I think it is harder when you haven't had a pregnancy complete before, but the way I had always got through things was that I wanted a successful pregnancy for myself and my husband (other womens' pregnancies didn't upset me or compare then) and it probably wasn't meant to be or my body wasn't able to sustain the pregnancy for some reason, so I have a certain level of low expectation that actually helps me be a bit pragmatic.
I was talking about genetic testing with my husband and I wasn't sure it would make any difference in the long run. With previous losses, I was desperate for my next cycle to start so I would have some sense of closure and could start trying again. Now I am not so sure, but maybe I may just see how my cycles pan out for the next 6 months, and look at ovarian reserve and blood tests, so Advanced Female Hormone Blood Test with Medichecks, etc. I don't really want to go back to infertility investigation again. I feel quite foolish at my age, but I have a fairly consistent infertility history and we didn't want to put pressure on ourselves as I thought our chances of even getting pregnant again are / were always low.
I have been using an AVA bracelet and I think that has really helped me track things, even though I put the data into fertility friend to see it better.