The antral count is how many follicles you will potentially grow this cycle. AHM measures your ovarian reserve - and lets you know if you have time on your side. A low AMH will mean a lower number of antral follicles per cycle. When going through IVF the number of antral follicles is the maximum number of eggs you can get that cycle. The antral count varies from month to month, but over time it's a downward trend.
My FS compared the antral count to a 100m sprint race - at the start of the cycle/race all the competitors/follies are lined up on the start line, and at the end of the race/cycle there is only one winner/mature egg. In a medicated cycle, all the athlete are taking performance enhancing drugs, so all make it to the finish line together!