While I had no trouble getting pregnant with my son, I'm well aware that fertility drops precipitously for many women as they hit their late 30s and 40s.

But he said that fertility declines in the years leading up to menopause, so more research is needed to work out if AMH levels can determine the point at which fertility actually drops.

The body, on the other hand, holds clues as to how fertile a woman is right now.