Nyquil and dayquil are actually both written on the list provided by my ob, so I can't imagine they are bad.
Robitussin/Robitussin dm is what I ob said is
safe, but for some reason it didn't work for me, also don't use Nyquil is bad and has alcohol in it. I would call your local pharmacy, they can tell you what you can use. I also use lemon cough drops, which my ob said was safe to use, mucinex, or hot lemon water works good too.
Honey is really good for coughs! Better in trials than cough syrups
My Dr told me only regular mucinex (guaifenesin) only. Nothing DM and no nyquil since it contains alcohol
Robitussin/Robitussin dm, dimetapp, dayquil/nyquil, mucinex