A cold shouldn't affect anything.
My OB posts the following list of medications that are okay during pregnancy; feel free to reference it, but also know that not all doctors have the same recommendations. Some people avoid medicine completely, "just in case.". I do not.
Crap I can't quite get to it on my iPhone. Her website is www.nswobgyn.com, and I know the medication list is under the "obstetrics" portion of her site, but I guess you have to look on a computer.
My OB's rule of thumb is anything Tylenol brand is fine, anything Advil brand is not.
That medication list is wonderful. Thanks for posting. I've been wondering too because I've been fighting off a sore throat and worrying about what to take.