I feel bad is this normal?

My baby who will be 3 MO in a few weeks. Has been sneezing and coughing here and therr i think she might be sick. Im a FTM and anyone else baby been through that? I keep her warm all the time i have taken her out but i make sure her outfits are warm and have blankets. 😕 idk i feel bad i feel like i haven't tooken care of her like i should. Now shes sick.