And my acupuncturist and others have success stories of women in their 40s who have healthy pregnancies on their own so I definitely think it's possible. You probably won't have any issues getting pregnant. Three rounds in, we haven't had any PGS normal embryos. Then it was 3 months after the m/c - hysteroscopy in b/t for possible left over product of conception which ended up in a polyp removal - that we did our first round of IVF. We ended up getting pregnant on our own and unfortunately had an early m/c. He wasn't averse to us trying IUI, but he was concerned about time passing if we had a m/c. My RE suggested we go straight to IVF because he did not think time was on our side as to egg quality. When my partner and I decided to start purposefully trying (we had an ectopic previously), I was 40 years old.
I'm surprised that your RE suggested IUI.