FYI - People are the most contagious before their symptoms start and the 48 - 72 hours after the start of symptoms. Tis the season for colds and flu and unless you are planning on not going grocery shopping, to the mall, movies or even just outside period you will be exposed.
The immune system is built by being exposed unless you have a compromised immune system, like Cancer, going through Chemo, HIV/AIDS. Your unborn child is protected by your immune systems and if you've been healthy all along there is no reason you should have a compromised immune system now. Of course I wounldn't intentionally expose myself to someone with a fever or severe illness but day to day exposure to people who don't even know they are sick is going to happen.
Congratulations by the way I had no idea you were pregnant.
nj