Has teds wife Tracy been seen before on any of the how i met your mother episodes?

Tracy, Ted's wife, is not seen in any episodes of "How I Met Your Mother" before the final season.

The show focuses on Ted's journey to find his soulmate, and Tracy is introduced in the final season as the woman who ultimately fulfills that role. This is a deliberate plot choice to keep the mystery of Ted's future wife alive for the entire series.