Pregnancy-bias complaints recorded by the Equal Employment Opportunity Commission surged 14% last year to 5,587, up 40% from a decade ago and the biggest annual increase in 13 years...An advocacy group, 9to5, National Association of Working Women, also is seeing an increase in pregnancy-bias calls on its hotline. The groundswell reflects both changing demographics and a new activism among mothers. It also shows that even now, 30 years after passage of the federal Pregnancy Discrimination Act, there is still confusion about what protections it provides...Pregnancy-bias complaints are likely to continue rising.