is it possible for weight loss or inability to gain weight to be a side effect of birth control?

i ask this bc we all know that gaining weight can be a common side effect. however since getting my iud in november 2024 my weight gradually kept going down and im now almost underweight for my height. for context i don’t remember the exact weight i was when i started but i think i was around 115 and now im at 100 and im 5’3. i’ve been trying to eat more than i normally have been but my weight just won’t go up. is it possible that the birth control may have something to do with this? and yes before yall say it i plan on seeing my doctor soon. thanks in advance