It is absolutely fine to layer products, as long as this is done in the appropriate order (as per the protocols of the particular brand you are using with, or unless the products have been recommended to you in a specific way by a qualified skin care doctor or therapist).
As long as you are satisfied with the results that you are seeing from your products, and your skin is healthy, glowing, and you are not seeing any negative reactions.
Many, many product brands certainly recommend layering of products for best results.