Who is the mother "How i met your mother"

I think I know who it is. In the first episode in season 1 Robin meets Ted for the first time when she is out with her friends. One of Robins friends has just been dumped by her boyfriend. Teds falls in love with Robin. I think In the end that Robin ends up with Barney and they get married and Ted meets one of Robins friends again at the wedding who he met for the first time in the bar in episode 101 with Robin. That is why he starts to tell the story from that moment. That is when he met the mother for the first time. I don´t know who of them it is but i know that "the dumped friend" is in more episodes than just the first one. Just look at IMDB