Try to focus on prevention now: Take Vitamin C (or drink OJ or eat oranges, etc.), eat really well (avoiding sugar, dairy, white flour products), and drink a lot of fluids. Take some echinaeca if you want. You can also have your kids follow these guidelines, so that hopefully they won't get sick and bring it home to you.
If you get a moderate to high fever (like 100 or higher) and need to take a Tylenol, that's fine. Don't take Advil, it is contraindicated in pregnancy. If you have a low fever or even a moderate one but still feel okay, trust your instincts on whether to take anything or not. A Tylenol here and there certaintly won't hurt your baby, but it's unlikely a moderate fever will either. Fever helps to burn out whatever bug you've contracted, so it's best to let it do it's job and not interfere, most of the time. Stay well!
Happily parenting our snuggly wild child since 2007 and her little brother since 2011!