I'm in my second trimester and am on the tail end of a sinus infection. It's been awful. I am also on Augmentin, which is another name for the one you are on. It is helping and clearing things up. Something that has helped tremendously, especially before bed is the sinus rinse bottle or the neti pot, it helps break up and clear out that infection. You can add golden-seal powder or zylotol powder to the mixture and it will boost white blood cells to fight bacteria and infection. Drinking Echinacea tea is also very good and can be used several times a day. I pray you get over this soon! Yay that your bundle of joy is coming soon!
Try using a Netti pot and some herbal teas, you can also try mucinex I did it for a few days to help clear up my sinuses when I had a major infection in my second trimester, it took longer than I wanted to clear up but it did work on it own.
Neti pot is in route should be delivered by tomorrow hoping it helps! Thanks ladies...