Please help - how do i get rid of my 2 month okd’s congestion?

Sarah • 29 • Baby Girl #1 11-3-19💕 • Baby Girl #2 2-8-21💕

My now 2 month old baby girl has been congested for a few weeks now and all the drainage is making her cough sometimes and she just seems like she’s miserable. I’ve been giving her this cough and mucus medicine but I’m not seeing any change. She’s due to see her pediatrician on Monday for her 2 month check up but do i need to take her in today?? I’m a first time mom. Please help.