Echoing everything already said
We rushed to IVF because my bloods suggested I was hurtling towards premature ovarian failure. However this was primarily due to my FSH rather than my AMH. My AMH was 1.5 at the age of 33, and my antral follicle count was just 5. My FSH was 17.6 (although it bounced down to 9.5 the following month, you're only considered as good as your worst FSH)
AMH is just a measure of quantity, as has already been said. High FSH is primarily a measure of quantity, and quality as has been said is primarily determined by age. However high FSH can mean poorer quality, hence this was the major concern
We weren't technically infertile as we hadn't been TTC long enough. I couldn't conceive naturally without medical assistance because I had thin lining, but it's very possible if we had done monitored cycles with timed intercourse (with oestrogen support for my lining) we might have been able to conceive naturally. But my bloods suggested I was hurtling towards early menopause so we felt we needed to pursue pregnancy very aggressively
I got pregnant on my second IVF cycle. No one understands how someone with barely detectable AMH got 17 eggs, the embryologists all asked if it could have been a lab error. I got pregnant, and have 4 embryos on ice
Sadly I miscarried @ 10w, but the tissue testing showed the baby was chromosomally normal ie the miscarriage was due to the soil not the seed, my egg and embryo quality wasn't the problem
We rushed so quickly because the FSH suggested we needed to act fast - and as my age was the biggest thing in my favour, the sooner we could act the better
Low AMH doesn't impact on TTC naturally as you're only ovulating one egg a month, so egg quantities are less relevant