I've been congested too with a slight cough for the past month or so and am getting to the end of it. I've been drinking hot water with lemon and honey. Sometimes I take a spoonful of honey. My dr asked if I would rather have a prescription for zyrtec or robitussin. I picked robitussin in case it was more than spring allergies.
I hope you feel better soon! A humidifier can help tremendously. Also, I hope this is not the case for you because it is super super annoying but some people are just congested most of their pregnancy because of the additional fluid volume in their body. I've been congested since 8 weeks but not sick, definitely not a fun experience but not harmful.