Personally I wouldnt, not this close to delivery.

If you are in the
third trimester of pregnancy, you
must tell your doctor you are
taking Polaramine because
newborn babies may have severe
reactions to antihistamine.
Tell your doctor or pharmacist if
you are breast-feeding or plan to
breast-feed.
Polaramine may be transferred in
breast milk to your baby.
Could you get through with a saline spray?