If you are in the USA, your AMH is just fine. You have to know what scale the measurement is based. .75 is the minimum most RE's like to see and anything above that is okay. Here in the States, we use this scale-
AMH Fertility Test, Anti-Mullerian Hormone
and over 1.0 is NORMAL. So, I think at 26 with a normal AMH, you are not infertile.
In the HT section, we have our AMH checked and I can tell you from all the fertile girls on there, it is all over the place. It is very common to see an AMH around .7-1.something. Over 3 indicated possible PCOS so it is a very small range. I can also tell you is varies although your RE will probably say it doesn't. I had mine retested and it went from .75 to 1.25 so it can absolutely change.
Have you been TTC long?