My advice to ask a pharmacist (or doctor) what is safe to take.
During my last
pregnancy, I got 3 really bad colds and the farther I got into my
pregnancy (30 weeks +) I had more options of what was "safe" to take....and I asked a pharmacist. It depends on the symptoms, but I was told that saline sprays and throat lozenges are safe....and then, when I was farther along, I was able to take over the counter cold remedies (ie. Tylenol Cold/Sinus).