Here's a good article that explains it -
http://www.whitelotusclinic.ca/blog/dr-fiona-nd/amh-pcos-test/
Check the units the lab used for measurement. If it's pmol/L, you're close to normal for your age. If it's the more common ng/dl, then it's way above normal and you should look into the possibility of pcos.
If there's a chance it's pcos, then check your vitamin D levels - studies show a link between pcos and low vitamin D levels. Vitamin D is known to impact ovarian function. You should supplement to get that up to a high normal level.