I want to know if I can take robitussin cough control and benadryl together I'm 33 weeks pregnant?

Better not. Robitussin cough medicines combos do contain an antihistamine, so you don't want to combine any of them with Benadryl, and just be cautious not to overdo it taking Robitussin preparations much on your own while pregnant, read the labels carefully, or call your doctor, wish you and your baby wellness.