Hi, usually you can expect to experience some pain after a workout, and it really does depend on the workout you have been doing.
If you have been mainly training your legs with weights for example, then you commonly have what is known as DOMS (Delayed Onset Muscle Soreness).
DOMS is usually experienced after strenuous exercise and takes the form of a dull pain in the area of the muscles you targeted during your exercise routine.
It can also be a warning that you are overworking your muscles if it is persistent, best to have it checked out by a professional if you are concerned.
This page has some great advice on how to ease the pain:
This video may help you as well: