I think we are in for a "Whose baby is it?" storyline with Amelia. It wasn't that long ago she was sleeping with Owen.
And seriously, what is it with these doctors and the inability to use birth control correctly? Off the top of my head the following have had surprise pregnancies:
Ellis Grey (Maggie - looking at you too, Richard)
Christina (twice? ectopic pregnancy with Burke, abortion with Owen)
Addison (pre-show with Mark)
Callie (Sophia - also Mark)
April (Harriet - with Jackson)
Amelia (again twice!!, first on Private Practice, now with