When might i start my growth spurt? <--- lol grammar fail but w.e?

I'm 11, 5'2, 101.5lbs and i've been the same for MONTHS. I used to be a lot skinnier but BAM. i gained a crud load. i used to be 94 pounds :PP i eat a lot of junkfood btw, which i cant help cuhs i'm a pig and i get the food i crave for whenever i want. it's like that with my family. anyways, When might i start my growth spurt?