What should you do for a pregnant woman who is choking?

First, cehck the mouth and see if you can remove the debris manually. If that doesnt work... If you feel there's danger to the fetus if you perform the Heimlich manuver, you can perform CPR style chest compressions. Note that this procedure is controversial. While chest compressions can actually cause greater outbound pressure than abdominal compressions, compressing the chest can damage ribs and the xyphoid process and, in some cases, cause cardiac arrythmias. As first aid requires that we do no harm, this one is a tough call.