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Meredith and Derek finally go to the baby doctor to see how everyone's plumbing is working, and it turns out Mere has a hostile uterus. And yes, that comes with as many jokes as you think it might. April is in on it, because she knew about the miscarriage, but Lexie doesn't know that and just thinks that Meredith is yet another person who thinks she's nuts and not worthy of being told anything important.
Lexie and April then have to work together on a patient who crashed her car into a laundromat, and when they find out that the woman did it on purpose to try and hurt her ex-husband, Lexie cracks and starts sympathizing with her just a little bit.