I am ~5 weeks pregnant and just now getting over a 3 1/2 battle with the cold so I can sympathize
The only thing I can suggest is trying Boiron's cold formula. They are a great homeopathic company and usually pretty easy to find. They make a "cold formula" that covers a multitude of symptoms and they make a cough syrup called Chestal with honey. I am not sure how much the cold formula worked for me (considering the length of my cold!) but the cough stuff worked great!
Wish you the best of luck!
PS: there is a very good book available called "Everybody's Guide to Homeopathic Medicines: Safe and Effective Remedies for You and Your Family" that are think is great to have around the house for times like this. It allows you to self-prescribe some basic remedies and is great for adults and children.