what can you take during pregnancy?

So I am trying to do everything that the research tells you to do while pregnant. Example...less caffeine, more fruits and veggies, less junk food...etc. I think I have caught some kind of bug from my step kids. I have been getting hot and cold, runny nose that turns into congested nose. Are there any suggestions of what I can take or do to help clear it up? Any suggestions would be greatly appreciated. This is my second pregnancy but my first resulted in a miscarriage. So I'm being overly cautious with everything that I eat, drink and even do.