losing weight on the pill???

so obviously most women say that they gained weight on the pill. i have been on apri birth control since march 26 of this year and i've lost 16 pounds since then. i barely go to the gym and my eating habits have not changed. my body doesn't even really look like i lost 16 pounds. is this normal? i went to the doctor today and she asked a bunch of questions but none of them related to any underlying issues so she didn't seem concerned. has anyone else lost weight on the pill?