Is it safe to take Robitussin (guaifenesin) multisymption CF during early pregnancy?

Ask your OB doctor. Every patient has her own unique medical situation. Most cold medicines have either phenylephrine or Pseudoephedrine for congestion relief. Either of these may have an adverse effect on your blood pressure. Elevated blood pressure is an all too common problem of pregnancy. Please ask your obstetrician about your specific needs.
FDA CAT C. It is fda pregnancy category c which means there isn’t certainty about the impact on a fetus. I would discuss it with your obstetrician to help determine if there are alternates and if the benefits outweigh possible risks .