Unintended Pregnancy Reduction Act of 2006 - Amends title XIX (Medicaid) of the Social Security Act to: (1) prohibit a state from providing for medical assistance through enrollment of an individual with benchmark coverage or benchmark-equivalent coverage unless it includes certain family planning services and supplies; (2 ) include women who are not pregnant but who meet certain income eligibility standards in a mandatory categorically needy group for family planning services purposes; and (3) allow a state Medicaid plan to provide for making medical assistance available to such individuals during a presumptive eligibility period.