Am I having another growth spurt or am I getting fat?

So over the past couple of months I've went from 8 stone 12 to 9 stone 3 and I'm really confused because I've been eating like I normally do and I've always been about the same weight. I'm 15 and 5 foot 4; and started my period when I was 13 but I'm pretty sure I had a growth spurt when I was like 11.
The weight that I'm putting on is worrying me as I really don't want to become over weight.
do you think I'm having a growth spurt or just becoming fat?

Fat

Your weight will vary with age. Unless it raises or lowers to an extreme, you should be fine.

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your waist does not have a growth spurt , your body changes as you get older ,and for some it can mean that fat is more easily recognised and added to body ,Tailor your diet to lifestyle ,ie in periods of low exercise eat less calories !!! Some lucky people can eat what they like all their life ,And other mere mortals have to watch our diet and plan excercise more as we get older . Good luck