When i was 13 weeks pregnant I came down with a horrible flu/cold. It was brutal!!! All i was able to take was tylenol, and hot water with lemon and pasturized honey. The doctor and pharmacsist said no to vapor rub. My chest wass on fire and so congested. I was also able to do the old fashioned steam flush (where you put your head over a bowl of steaming water with a towel over your head to breathe in all the steam). I hope this helps!!
My OB said I can take Benedryl, Claritin or Zyrtec (I am allergic to Claritin and Zyrtec gives me headaches so am taking Benedryl). Allegedly, Chlor-trimeton is safe until the 3rd trimester (that is what I usually take) but I decided it is better safe and sleepy with Benedryl :)
My nurses' drug book lists them all as Pregnancy Category B, the same as Tylenol.
Springtime in NE Oklahoma is probably as bad are Arkansas :) We've also had high winds and a lot of fires so you have my sympathy. You are not sniffling alone! (((hug)))