Its about a woman and man who work in the same workplace, i think he is her boss. They start a relationship , but they have to keep it secret. Eventually their relationship is found out, and the guy has to leave the workplace and transfer to another place,(because both of them cannot work in the same place) a bunch of stuff happens. I think at one point she is pregnant, but loses the baby? Any ideas?

The only manga I can remenber is kimi kara no resume, but I think there was no pregnancy, not sure.

Only things I've read that are close to this are midnight secretary, chou yo hana yo and to be honest I remember next to nothing about either one...

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Few favs
Comedy:
Kyou kara ore wa!!, Mx0, Angel Densetsu, Skip Beat, Ai Kora, The Devil King is Bored

Romance:
Hana to Akuma, No bra, Shinigami Trilogy, kindan no koi de ikou, Usagi Drop, Threads of Time, Girl Friends

Most under rated:
Kindan no koi de ikou, kyou kara ore wa!.
m0r l83r... maybe >_>