Pica!!!

Hi...I'm 30 years old and I developed Pica when I was 14 it was just the smells of cleaning supplies and soaps and when I became pregnant with my first born at 19 it turned into eating soap. I've been eating soap since then but don't know if it affects it has during pregnancy I really want to stop but don't know how. The Dr say it's normal and might be that my iron is low. Do anyone else have Pica or crave non food things?