Hi, E.! I went through the same thing while pregnant with my middle child - that was my one huge symptom, especially the stuffiness/congestion.
I believe it's too early in the game for you to take Sudafed yet, but here's what I discovered BECAUSE of that pregnancy.
Get a neti pot! Wonderful little thing!
If you don't know what a neti pot is, it's a little "tea pot" looking thing with a long, straight spout. Holds anywhere from a few ounces to a cup of liquid. You fill it with warm, "clean" water with a bit of SEA salt (as salty as "tears" taste; do not use iodized salt) and, no kidding, you flush your nasal passages with this water. I know it sounds odd and even "ew!", but it's like a "sinus enema" and no, you don't inhale it up your nose. It will actually "pull" mucus from wayyyy up there in your sinuses. Not to be gross, but even on a good day, you'd be surprised what gets cleansed out!
I don't know if we're allowed to post links to stuff here, but I'll try. They sell these at Walgreens (plastic) and I've gotten nice stainless steel and ceramic ones from the Sunrise Health Food store in Flossmoor. It's worth a look-see. It's drug-free and, when done in the morning, can have you breathing easy all day. Here are some links:
http://www.sinucleanse.com/netipotlanding.htm?source=goog...
And a demo video below (you'll giggle, but this is how it's done and hon, it does work - good luck!)
http://www.youtube.com/watch?v=j8sDIbRAXlg