ive been eating healthier and working out at the gym for three months and i went up a pants size.?

[Yesenia Leon]

by eating healthier i mean not drinking soda and eating fruits and veggies instead of chips and candy. i go and work out at least 45 minutes. before i never did any of this and was always the same size now that im trying to loss weight i went up a pants size. what am i doing wrong ??????