AMH (anti mullerian hormone) is a hormone which is often measured by IVF clinics to identify how hard your ovaries are working, it is NOT a direct measure of your ovarian reserve.
Women are born with all of their eggs, so it is not possible to create new ones. AMH can go up as well as down, for example if you have Poly Cystic Ovaries you may have a very high AMH, but this does not mean you have a high ovarian reserve. A small number of eggs will be maturing at any one time, these are known as antrical follicles and can often be seen on a scan of the ovaries. Egg quality is a more relevant factor when trying to conceive naturally and this can be influenced positively through nutrition and lifestyle changes prior to conception. The lowest AMH I have successfully worked with is 0.2, I haven’t worked with lower so I can’t say if this is the lowest possible to succeed to conceive.
Low Ovarian Reserve is a term often interchanged with low AMH. There is no doubt that as women get older their ovarian reserve declines and so too their egg quality can decline. The good news is that nutrition and lifestyle changes can improve egg quality and only one good egg (along with healthy sperm) is required for a successful conception.