Suggest Treatment For Sinus Infection

Hi. I just recently had the flu...then it turned into a sinus infection. After a full round of antibiotics, I feel much better, but I am still experiencing a little heaviness in my chest, and after I have been laying down for a while, I will get a slight rattle in my chest at the very end of a deep inhale. That only happens for two or three breaths and then is gone. Other issue is that I am pregnant, so I am not wanting to take any more medication if I can help it. Should I be concerned?