(Beaverton, OR)  --  A pregnant woman is hospitalized after being pistol whipped.  The Washington County Sheriff's Office says the incident happened yesterday on Southwest 189th Avenue a few blocks south of Farmington Road.  The woman approached the man about drug activity when he hit her in the face with the gun.  Authorities later arrested Robert Brooks for assault.  Deputies served a search warrant at his house and found several guns, nearly six pounds of marijuana, various pills and meth.