I would think they would have LOW FSH actually because if they are not ovulating or having a period it means that the body is not trying to mature any eggs for the cycle. High fsh means your body is working to produce possible eggs to ovulate for a cycle, but a if there is no fsh stumulation the body would not release any eggs.
I wish you luck on your ultrasound results. When are you going to find out the results. Are you not having regular periods ?
Keep us posted