All medications come with something called a 'package insert' which has labeling that includes any risks. Did you tell your doctor that you are expecting? I would just call the office to be safe and tell them you are pregnant and want to know if the antibiotic prescribed for you is safe during pregnancy. I expect that it is as most are but it would be best to run it by your doctor You can go online and look up the drug's package insert and labeling pertaining to pregnancy as well. good luck and I hope you feel better.
What antibiotics are you taking? Did your dr prescribe these antibiotics for bronchitis knowing that you are pregnant?