In "Grey's Anatomy" in what episode does Christina lose her baby, and how?

She became involved with Dr. Burke; after she became pregnant, she kept the pregnancy a secret from him until she collapsed one day at work and learned she had an ectopic pregnancy, which had to be aborted. Not sure of the episode but Season 2-Episode 4 states: As Cristina tries to recover, she proves to be a very difficult patient and this is the only note I have found where Cristina is hospitalized. She lost the baby in the previous episode.

https://en.wikipedia.org/wiki/List_of_characters_from_Grey%27s_Anatomy

Depending on how you number the episodes it's either episode 12 or 2-3 it aired 9 Oct 05 and is titled "Make Me Lose Control"

Cristina Yang (played by Sandra Oh)
Loves scrubbing up. Girlfriend of Dr. Burke and actually got pregnant by him, a secret she kept until she collapsed one day in surgery; the pregnancy was then revealed to be an ectopic pregnancy and had to be aborted.

https://en.wikipedia.org/wiki/List_of_characters_from_Grey%27s_Anatomy