You may want to mention that to your midwife it's called pica. It's when you crave something that has no nutritional value and usually means you are lacking some sort of nutrient in your diet. My sister craved ice and that is a form of pica and it means you need more iron in your diet.
Midwife or doctor sorry I use a midwife I'm used to calling it my midwife instead of doctor lol
Oh thanks haha I never would have thought to mention that to her