How i met your mail there season 4 pregnancy

I think there may be some confusion here!

There is no TV show called "How I Met Your Mail" (although that would be an interesting concept!). The correct title of the show is "How I Met Your Mother" (HIMYM).

In Season 4 of How I Met Your Mother, there is a significant plotline involving pregnancy. The character of Lily Aldrin (played by Alyson Hannigan) becomes pregnant with her and Marshall's (Jason Segel) first child. This storyline is a major part of the season and has a significant impact on the characters and their relationships.

If you have any specific questions about the show or its plotlines, feel free to ask!