Hello, I Am 30 Years Old With No Medical History

Hello, I am 30 years old with no medical history other than typical sicknesses such as strep, flu, etc. For two days, I have been experiencing some chest pain that comes and goes, but I have shortness of breath associated with it. I have had a what I thought was a cold with this weather, but am wondering if it has maybe turned into pneumonia. Of course I am young with small children, so just concerned...