Medicine while pregnant

Posted something about it before, but didn’t get much input so im hoping this time around will give me some.

pregnancy question: So I’m 27 weeks pregnant and I’ve been sick the entire time. I’m not talking about morning sickness tho. I mean a nasty cough, congestion, lost voice, etc. ALL. THE. TIME. When I went to my doctor I felt like she was dismissive & just told me to take robitussin as needed. Anyways, 27 weeks in & feeling no better, I’ve now decided to give up on the medicine bc it does nothing for me but I’m now freaking out that I may have taken it for too long of a time and caused damage to my baby. I was taking it once daily at night time EVERYDAY just so it’ll soothe the coughing and I could try to get some sleep. Did I do any damage?? Anybody similar???