Harry comes to John in a panic - she's on the mend with Clara, after a long rough patch, but . . . she's pregnant. And she won't talk about what happened. (Could be a rare fling with a man, could be a drunken bad decision, could be rape, whatever.) She doesn't even really know what she wants John to *do*, exactly, but she's panicked because she's sure Clara doesn't want kids and things are finally, FINALLY going well between the two of them.

John talks her down and helps her figure out what to do - keep the baby, give it up, abortion, give it to John and Sherlock, give it to Mrs. hudson, whatever - I just want to see Caring!John solve all the priblems :-)