Is my calorie intake correct?

I started P90x3 last week and I'm following the nutrition plan that comes with it, I'm currently eating around 2100 calories a day which is a big step up from what I'm used to.. I currently weigh around 64kgs and have minimal muscle and some fat (I fit into the skinny fat category), I'm just a bit worried that I may be eating too much and that I'll start gaining fat rather than muscle, any help or reassurance would be great, Thanks!