Is it normal for me to go from a size 0 to a size 2?

Im getting older im 19 so im not sure if my body is changing! Im gaining a little weight but working out! Im still a 0 but my pants are a little snug! Like i can fit both of my hands in the front of my jeans when their buttoned and zipped! I just wanted to know of this is normal!
Is it normal for me to go from a size 0 to a size 2?
Post Opinion