Hello, and i hope I can answer your question. If you really have a sinus infection or bronchitis, you need to be treated with antibiotics to clear it up completely. Many physicians who are not obstetricians are not comfortable prescribing antibiotics for pregnant women because they do not know which ones are safe. If you were my patient, I would treat you with azithromycin or a penicillin-based antibiotic because these are safe during pregnancy. You may want to ask your OB for advice and/or a prescription instead of a primary care doctor as they are more comfortable and familiar with antibiotic use during pregnancy. you can even have a chest x-ray safely in pregnancy if there is any doubt of your diagnosis. All of the over the counter medications for cough, cold and sinuses (in the US) are safe to use during pregnancy and may help with your symptoms. However if you have been sick for that long I would recommend antibiotic treatment. I would discuss this with your treating doctor. I hope this advice was helpful, good luck with your pregnancy, and I hope you feel better.