Is NyQuil safe while pregnant?

Angelica
I've been feeling flu like symptoms all day. Typically I take DayQuil/NyQuil and Vitamin C. I don't think I can take any additional vitamin c because of the prenatal and I don't know if the cough suppressant and other ingredients are safe while pregnant. Opinions?
The ingredients are
Acetaminophen 
Dexteomethorphan HBr
And Doxylamine