new to the pill😳

I am on my 3rd week of birth control in the pill form and I have experienced most of the normal side effects: skin clearing, crazy mood swings, etc but one I was dreading was weight gain! when I started bc I was about 135 lbs and 5'3 which is about as heavy I can be and still be "normal" I was so scared that starting this was gonna make me huge but crazy enough it has done the opposite so far.. I have been unintentionally starving myself. ever since like 3 days in I have not felt huger or stomach growls or anything . I have felt thirst craving but that is all. the only food I have eaten is things that sounded appealing to my taste buds or because I would go an entire day and forget to eat and my mind would remind me..at first I was okay with it but now it's starting to scare me. I don't have any bodily desire to eat other than I know I HAVE to and I was wondering if anyone else has experienced this. I have lost weight already and in the mirror I feel good but deep down I know I'm hurting myself.