You are right you don't have to be concerned about FMLA, but you do need to be concerned about discriminating due to pregnancy under the Pregnancy Discrimination Act (PDA).
http://www.eeoc.gov/facts/fs-preg.html states "An employer cannot refuse to hire a woman because of her pregnancy related condition as long as she is able to perform the major functions of her job. An employer cannot refuse to hire her because of its prejudices against pregnant workers or the prejudices of co-workers, clients or customers.
An employer may not single out pregnancy related conditions for special procedures to determine an employee's ability to work. However, an employer may use any procedure used to screen other employees' ability to work. For example, if an employer requires its employees to submit a doctor's statement concerning their inability to work before granting leave or paying sick benefits, the employer may require employees affected by pregnancy related conditions to submit such statements.
If an employee is temporarily unable to perform her job due to pregnancy, the employer must treat her the same as any other temporarily disabled employee; for example, by providing modified tasks, alternative assignments, disability leave or leave without pay. {Doesn't sound like this is the case...sounds like she is able to perform...so I am not sure altering the assignment would fall under here}
Pregnant employees must be permitted to work as long as they are able to perform their jobs. If an employee has been absent from work as a result of a pregnancy related condition and recovers, her employer may not require her to remain on leave until the baby's birth. An employer may not have a rule which prohibits an employee from returning to work for a predetermined length of time after childbirth."
SECOND SOURCE:http://employment-law.legalmatch.com/
"Two primary federal laws guide most state Pregnancy Laws. The Pregnancy Discrimination Act (PDA) protects parents-to-be; this came into federal law as an amendment to the Civil Rights Act of 1964. Passed by Congress in 1978, the PDA makes it illegal for employers to refuse to hire, fire, or deny a promotion to women who are pregnant. The law also provides that employers must treat a pregnant woman the in the same manner as it would treat any other employee that becomes ill or temporarily disabled. More legal information about these laws and other employment and hiring issues can be found at LegalMatch.com in their LegalCenter Law Library "
Did your attorney discuss anything outside of FMLA? Did he/she say if/how PDA is applicable ? If not, I would ask that question.