I am 30 weeks pregnant . I am have a persistent hacking cough which comes in spells, even waking me up at night. When it starts, it s horrible and I can t stop. On March 14th my obgyn prescribed me a Z-Pac. Then on the 24th he gave me a codeine/guaifenesin syrup. I am not producing any phlegm . I feel it in there, but I am not getting it up. At this point I am feeling desperate. I am concerned about my baby being effected. Dr. never performed any tests to get to the bottom of this and says that it s to late to test anything. What should I do?