Not an oops, but after flunking three IVF’s got pregnant naturally at 40 and 43, and had those kids at 41 and 44. There were two other miscarriages at well, one between pregnancies and one after I had my last child.
Get your thyroid in order (tsh under 2.5, targeted to 1.0), get vitamin D levels to the high end of normal, through sunshine and supplements. Take all the supplements. I took resveratrol, pycnoganol, royal jelly, CoQ-10, various amino acids, acupuncture with herbs. Acupuncture was huge - it absolutely changed my cycle for the better and reduced my cramps.
Best of luck to you. Those were crazy-making days. My heart goes out to anyone having difficulty getting pregnant.