I've replaced the first chapter with this drabble instead of adding it as a new chapter because it was brought to my attention that my original first chapter bore an uncanny resemblance to 'Grounded!' by oldmcpiper. I did read this fic a while ago and must have had it in the back of my mind while I was writing my own chapter, but the similarities were entirely unintentional and I apologise for it. I have taken that chapter down and would suggest that you go and read 'Grounded!' because it is a very good story.
Mary Margaret ran her fingers over the baby blanket yet again. She had tried many times, but she couldn't explain the connection that she felt to it. Lifting it from its box and holding it gently against her cheek, she could have sworn that she heard a baby's cries and the clash of swords and a soft whisper: 'Find us.'
Mary Margaret dropped the blanket, shocked to find that there were tears in her eyes. Shaking her head, she pushed the strange sensation from her mind, dismissing it as sleep deprivation and an over-active imagination. She had almost forgotten about it, but, that night, she fell into an uneasy sleep with the whisper of "Find us" echoing in her ears and a dull ache in her heart for something she didn't know she'd lost.