Baby cough 3 months

Sorry if I sound ignorant, I am a first time mommy.

My daughter has been coughing this morning. Not super bad, just little coughs. She’s never coughed before. We have another baby in our house who is one month old and he has been sick. Today is supposed to be my first day back at work. Should I take her to the doctor? Or is it something I should monitor first to see if it gets worse? I’m only unsure because she’s never coughed before and she didn’t nurse very much when she woke up just now. The cough seemed to be what woke her up. I’m supposed to get ready for work now so I’m not sure what I should do.