My doc told me to take Robitussin. My cold went away in 2 days
Vitamin C. You can take 1000mg a few times a day. You'll know if you've taken too much as it will cause loose stools. If that's the case back off a dose or two a day. Your body eliminates the excess so it doesn't build up. It's safe and beneficial during pregnancy.
Here's a link that might help: http://www.allinahealth.org/Health-Conditions-and-Treatments/Pregnancy-care/Over-the-counter-medicines-safe-to-use-during-pregnancy/
What kind of sick? Cold or something else?