If you have used your visa you got it in Vancouver( I
mean the immigration officer at border checkpoint has
stamped on it,you have to apply a new visa again,if not,I mean if you enter USA with H4 approval notice &
old I-94,the visa is avaliable now.Check your I-94 ,is
it new or old,then you know.
Did you try to contact the VO or US immigration officer at Vancouver international airport before you leaving Canada?
mean the immigration officer at border checkpoint has
stamped on it,you have to apply a new visa again,if not,I mean if you enter USA with H4 approval notice &
old I-94,the visa is avaliable now.Check your I-94 ,is
it new or old,then you know.
Did you try to contact the VO or US immigration officer at Vancouver international airport before you leaving Canada?