ugh winter cold! I'm only 4 weeks along

Nicole
Afraid to take anything except cough drops. I'm hoping the last couple days are near but I've had a bad cough and my nose is so runny I could bottle it! I read online not to take anything during the first trimester. My hubby came close to getting me Robitussin DM but I said no. I've always heard about girls getting bad colds very early on and their babies are fine but I'm a worry wort I guess. I basically got a respiratory tract bug from my mom who's a school teacher and probably also dealing with pregnancy rhinitis. I read to take vitamin D, is this a good idea?