i am guessing but i bet you were the one that asked about afrin? the simple answer about zicam is "we don't know if it is safe or not". some authorities advise definitely not while othera seem to think it is safe since it is only zinc. it has not been tested in a controlled study during pregnancy namely since most pregnant women would not be willing to participate for fear that it was hazardous. zinc may be helpful in shortening the course of a cold but you probably do not have cold but rather a condition called vasomotor rhinitis common in hormonally-charged women in their third trimester. i don't think that zinc is going to help you. besides since you don't really know if it is truly safe why take the risk? my recommendation would be not to use it.
is zicam safe during the third trimester of pregnancy