You seem to be suffering from a chest infection
. Since you did not get any relief from the simple remedies you had tried, I think you should visit a physician and get treated in consultation with your obstetrician. You should also get an antenatal check up to done to assess the fetal condition as infections often can lead to uterine disturbances, though usually mild. You may need an antibiotic, anti-inflammatory and anti-histamine
medication in addition to steam inhalations or nebulization. Take care.