Do you have an office in India? Even in a work from home arranagement, what will be the total number of employees in India? If the total number of employees is equal to or more than ten, then the maternity Benefits Act, 1961 will be applicable to your establishment. A woman employee who has put in at least 80 days' service in a period of 12 months immediately preceding the expected date of delivery should be given 26 weeks leave with salary.
An independent contractor is not an employee but it is not the designation that decides whether an employee is an employee or a contractor. A person working exclusively for an employer following the working hours, leave rules and other protocols framed by the employer is an employee who should be given all benefits offered by the statute. Maternity Benefit is a statutory benefit and the same cannot be refused to an employee in India.
It is immaterial where the employer is situated but what is important is where the employee is working. As said above, if the employer has at least ten employees working in India, the establishment in India would come under the scope of Maternity Benefits Act 1961.
If the conditions above mentored are satisfied, you may send a notice of pregnancy attaching the medical report mentioning the expected date of delivery. If thee same is rejected, there are law enforcement Officers to take care of it. Online facilities are also available in various state's labour department.