Unfortunately almost every medication that is considered "safe" during pregnancy is Class C and most of the time all you can do is suffer through it. I would try some other methods of relieving your symptoms:
-Neti pot
-Humidifier
-Vicks Vapor Rub
-Warm tea
I was told that nasal sprays are ok too a saline spray might really help relieve some of that pressure???, and benadryl, and tylenol cold.
Hope you feel better soon!
I now have a MAJOR sinus headache...OMG........
Did the saline spray to sleep....guess I will have to suffer through work! urgh.,.....