Our expert says:
You exercise routine is not that demanding, so I'm leaning towards "no" as the answer. You often get this amenhorrea in women who train a lot - but here, we're talking fifteen hours a week, or more. Your training is a quarter of that, so it's unlikely.
However, that's not to say impossible, because there is an interaction between activity and diet, and so your exercise may still be contributing, given your diet.
I'd suggest you consult a doctor about this though - they'll be able to establish quickly what the cause is, and then you're able to know for certain what needs to be done. And also, if it is neither diet nor exercise causing it, then something else is, and the doctor can help you with that.
So I hate to pass the buck, but you need to probably see a doctor and consult.
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