Is it safe to take Emergen C or Airborne during pregnancy?

Um... sort of.
They're both dietary supplements, so if you are taking pre-natal vitamins it can cause vitamin toxicity, which can be dangerous to you and your child. Also going over recommended doses of vitamin C can cause risk of premature birth, and vitamin A excess can cause birth defects.

You should consult with your doctor before starting any new vitamin supplements while pregnant.