umm i don’t really know because im no professional but if you’re not hungry and you’re not forcing yourself not to eat then try drinking special shakes that give you enough protein and whatever you need that you aren’t getting because you aren’t eating much. I would talk your parents or an adult about it. Just to make sure there’s nothing wrong like being sick.
wait for your period! That’s like the best thing you should do. If your period doesn’t come and you dont want to talk to your parents or a doctor i would do a pregnancy test (those you pee on isn’t called like a peestick?) point is you should do it if your period doesn’t come. If i were you i’d probably do it twice just to make sure. If for some reason it says you’re positive for being pregnant then thats when you talk to a doctor!