http://www.pandinusimperator.nl/en/story_EN.htmI dont know if it's the same with forest scorps, but i can tell my male and female emperors apart pretty easily. The claws on the female are a good deal smaller and shes got more junk in the trunk. The male's rear sort of tapers off while the female's body is shaped more like a sausage.
But Scorpdemon is right, pics would be best. If you don't have a camera you can go back to the pet store and compare your scorpion to the others or do a little research on pectines and tell us how many teeth yours has. Im sure someone in here will be able to tell you for sure what you have if you can count those.