Definitely let your doctor know this. Pica can be because of chemical imbalance as well as some issues with nutrition. I would talk to your doctor because either of those require doctor supervision to rectify. Don't eat it!! Talk to your doctor so they can help you. good luck
If you want to eat it, then you may have pica. Talk to your doctor about this right away, because your body is missing nutrients. Take care, and I hope you don't give in to your cravings.
Pregnancy does wierd things to your body. Some women, not all tho, have cravings for non food items like dirt, ice, soap, ect. Ect. I believe the term is called PICA? Not 100% positive if thats what its called. Usually it means that you are lacking something like iron or could be something else. Its completly normal, just dont indulge in the detergent :)