Where Rose and Tentoo travel with their Universe's Amy and Rory and the exact thing happens to Amy where she gets kidnapped pregnant but Amy and Rory actually get to keep the real infant Melody at the end. If that's too much, please let me know.
It was a good thing Torchwood survived for centuries, because Rose wasn’t sure she and the Doctor alone had the manpower to retrieve Amy from Demons Run. It was also an even better thing that Torchwood kept good tabs on the timeline of their time-travelling COO and that her status was somewhat legendary, because that meant she could pretty much take over whatever branch she happened to encounter.
The Torchwood of the Time Period they had tracked Amy to was monitoring the quadrant Demon’s Run was located in, and no one had been going in or out. The Doctor had taken a surprisingly short amount of time to figure out a way to counter-act the Silence’s abilities, giving the Torchwood agents of that time a sort of implant in the memory centers of the brain that would store the memories the Silence made them ‘forget’ and play them back to the affected individual. As a result they were able to operate far more efficiently than before.