Post partum loss of appetite

I’m 6 week post partum after a twin c section and I’ve always had a big appetite, but it seems to have significantly decreased. I thought it would have been back to normal by now. My sister told me I look thinner now than I did before I was pregnant. but is this a sign of post partum depression? Anxiety? I definitely do have a lot of anxiety, but idk if it’s a concern or just regular old nerves and stress that come with being a new mom…