Do you have the right to enforce a trademark if the trademark application is pending and hasn't been approved yet?

No. One does not have a right to enforce a trademark before it is registered. However, a person can indicate its use and intimation that the trademark is applied for registration by using the ™ sign beside the brand name until its registered.

Further, if you find others using your brand name without your permission, you can surely claim remedy in form of passing of under civil law in India.