When do you start to worry?

My LO woke up this morning congested. She’s still breathing out of her nose but when she cries and coughs you can hear it. She’s eating normal and having normal amounts of wet diapers. She has no fever and when she wakes up she’s smiling but she’s been sleeping a little more. I’ve cleaned what she does have in her nose out and have been using the saline mist to help loosen the mucus in her throat. But at what point should I worry. I guess the paranoia kicks in and the should I take her should I not questions pop up.. my oldest who is now 6 used to get croup all the time and my middle who is 4 used to get ear infections... she does keep putting her hand up to one ear. And she’s been more fussy at night. Should I give her Tylenol?