Dehydration in a toddler

Abigail

My son has pneumonia and hands, foot and mouth. Yesterday I changed 4 wet diapers, and 2 diarrhea. Today I’ve changed 3 wet, and 2 diarrhea. He goes 2-2.5 hours without peeing. The day isn’t over yet but I’m worried that he could be dehydrated still. Do I call the dr or wait?