Is there a way to see if it is a baby/deciduous tooth or an adult tooth before it comes out?

Yes. It is very easy: To tell the difference between a deciduous tooth and a permanent tooth.

Radiograph: Your dentist will have a radiograph of the tooth in question and can make that determination.

Different anatomy: Baby teeth are sized and shaped differently than permanent teeth. Additionally permanent teeth don't fall out on their own unless you have exceptionally advanced gum disease. Please see your family dentist now for evaluation and discussion of replacement treatment.