Mucinex DM

Krystal
Last night I took Mucinex DM, as I needed something to help uncongest me. My sister told me it was safe to take but then realized it's only the Mucinex that is safe, not the DM. This morning I vomited and I just can't seem to shake this nausia, which is something I haven't had since the beginning. I am currently 15 weeks. 
I understand I should have asked my doctor and still should, but has anyone ever done this? I'm so worried that I may have caused harm to my baby. Since I vomited, should I still worry?
Please help!