Remember how Katherine Heigl's character in "Knocked Up" hid her pregnancy for a while because she was afraid of how the folks at work would react? If only she'd known she couldn't have been canned or demoted, thanks to the 30-year-old Pregnancy Discrimination Act (PDA), which says moms-to-be "must be treated in the same manner as other applicants or employees with similar abilities or limitations."

Great -- except it seems like lately an awful lot of employers are ignoring the rule. A new study found the number of pregnancy-discrimination complaints is growing faster than a fetus.

Data collected by the Equal Employment Opportunity Commission (EEOC) shows the number of charges has increased 65 percent from 1992 to 2007. While there's no clear reason for the jump, cases have included pregnant women being denied a job or a promotion.

And complaints have soared particularly for women of color, by 76 percent according to the EEOC. That's compared to a 25 percent overall jump during the same time period.

The reason for the high incidence of complaints logged by black mothers might be due to their pregnancy rates, which are two-thirds higher than the rate for non-Hispanic white women according to the CDC. And in 2003, the Bureau of Labor Statistics reported that black mothers with children under 18 years of age (78 percent) are now more likely than white mothers (70 percent) to be in the labor force.

Good thing the National Partnership for Women & Families has a plan to school these clueless employers. It includes probing the complaint breakdown by race, state and industry, and launching a nationwide enforcement and public education initiative.

Tell us:
Were you ever discriminated against at work while with child?