Will my pomspitz a teacup?

I recently bought a month old pomeranian crossbreed japanese spitz. The seller told me that it is a teacup one. How can i tell if it really is a teacup pomspitz?i havnt seen neither dam & sire of the pup but d seller said that it is a teacup pomspitz. My pomspitz is about 7-9 inches now. Comments are highly appreciated. Thanks!