J.R.
It is possible I still am and my son is six years old.
One other cause also can be an overactive putuitary gland. I have to have blood tests yearly with my endocrinologist because I have a history of it. If this is the cause it can cause you to also lose your periods. That is what happened to me after I went off birth control and tried to conceive my first. My prolactin level was the level one has when they are pregnant around 130 (0-30 normal, 30 and above pregnancy levels). You could ask your doctor to check the levels, all it requires is a blood test.
Good Luck