Daughter has wet cough

my daughter is 3. she had a just wet cough and nothing else for like 2 weeks. at her well baby, she was getting better and the doc said she looked good so we didnt do antibiotics. she got better and now she has a runny nose, congestion, sneezing and a wet nasty cough. she has been this way for 3 days now. should i get her in or wait and see. i am on my second round of antibiotics for sinus infection and my oldest is on them as well, she was sick with cough and fevr herself for days.