Sammy I started TTC when I was 38 and had 3 MCs, then I had DC1 at 40 and DC2 at 43, not too far off my 44th birthday to be more specific. All natural (DC1 was conceived right before we were due to start IVF). This was with DH having fertility issues as well so we were actually lined up for ICSI, not IVF. DC2 in particular was a shock because it happened first time and no issues at all. I really didn't expect that with our gas, TTC history and DHs issues.
I remember very well the heartache and total despair. I thought life wouldn't be worth living if I never had children. Each MC was a massive blow, and each month when I didn't conceive was brutal.
It was also a hard learning curve. Until then I spent my life with the firm view things could be fixed if I thought hard enough, worked enough etc. But the MCs taught me Nature is the ultimate boss. You may have had that exact same MC at 37 or you might not have. There is NOTHING in Nature that says if you'd started earlier you would have a DC now. You can't plan a life on uncertainties. Your decision to wait was the right one, because you weren't ready. It's that simple. So don't waste time with regret. It's very hard letting go of our western notion we can solve things (even retrospectively) but I think the reality is you can only do what you can do at the time and ultimately it's in Natures hands.
I will say though that what I eventually did is ensured I was PG ready. No booze at all, ate very healthily, folic acid etc. I also bought a persona fertility monitor, which I think helped me conceive 5 times so... But I can't say for sure that any if this had anything to do with my good luck. It may have happened anyway, but it helped my 'fixer' character to feel as if I was actively positively helping.
I did have one regret I could have addressed, and that was DH and I both getting checked out sooner. Had I known he had issues at 38 (instead of us assuming it was just my age) I may have chosen not to spend two years TTC naturally. But even so, IVF may have resulted in MCs anyway with the addition of the emotional toll of IVF as well. Who knows.....
Apart from that, stay away from stats and information that will torment you.
And it is absolutely true that that MC, as devastating as it was, is a positive thing. It shows you can conceive. That's very very positive.