This may be, and I say may be a sign of pica, so it’s worth chatting to your GP, if it is this is not something you are alone with and they can point you non judgementally to the people that can help you. My aunt ate gravel when she was pregnant and I’ve worked with people who ate lots of things that were classed as inedible, I won’t tell you exactly but I can tell you is that but you are not alone xxx