Vicks vapor rub is safe, and you can try a steam treatment. Just turn your shower on hot enough to make steam, let it run with out turning your exhaust fan on, then breathe in the steam (without getting overheated of course), usually five to ten mins helps. A humidifier is a good idea too :-)
My suggestion would be to go the the FDA website. They have a list of medications They approve of for pregnant people. Hope you get go feeling Better soon!