I am almost 33 weeks pregnant and i am craving mud/soil?

ITs so bad i want to go in the back garden and dig some up but i know its disgusting cats could of pooed in it e.t.c its driving me nuts insane what can i do, the only closet taste that comes close is new potatoes and baby sweetcorn (raw) anybody have any ideas how to overcome this?
Update: Yes i am low on iron i have to have a b12 injection and i take 3 iron tablets a day!! Spot on but i still crave the mud/soil tho
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