It depends on what it says before or after it. If it says end with right side facing, then your last row is the right side. If it says, "with right side facing, pick up, blah, blah, blah, then you will have done a wrong side row last.
One way to be sure is to look at what the directions say next. If the next row is a ws row, then the one you're doing now will be the right side.