How long after weight loss and becoming more active will my period come back?

Ok, so about 2 months ago, I had started playing field hockey (my first team sport) and also going on a diet. That diet was OK at first, so I had my period that first month with field hockey and dieting, but then I started eating too little and went into starvation mode, while the field hockey season was getting harder with the start of school, too. I think because of all these factors, my period didn’t come the second month. I told my mom, and she said it was probably because I had started playing a sport and also because school might have stressed me out (I didn’t tell her about the starvation mode thing). I’m now starting to gradually work my way out of starvation mode, and field hockey season is officially over. I went from 109-about 100-101 pounds after starting field hockey and steadily lowering my caloric intake, and I am 13 years old, 5′0″. I first had my period about a month before I turned 10, and it became regular when I was late 10 years old, early 11 years old. If my period were still regular right now, it would probably be coming within these next few days, but there doesn’t seem to be any signs of it returning for this month. Does anyone know about how long it should take for my period to come back, or if it’ll come back at all? Please, let it come back!
Oh, and P.S., I have never been sexually active or anything like that, so I doubt I’m pregnant.

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