Well, in the world of the 'Nanny McPhee' tales, she is a rather magical and powerful nanny. 'You are the end of the story' might be a statement about her being the solution to all the issues in the story. For example, she uses her unique methods to teach the children lessons and transform the family's situation. So, her presence signals the end of the story's main conflict as she is there to set things right.
It might signify that Nanny McPhee is the ultimate resolution in the story. Just like how in a story there's a beginning, middle and end, she represents the end where all the loose ends are tied.
Nanny McPhee's story is about how she uses her magic and wisdom to guide a troubled family. She has strange looks but a heart of gold, and helps the kids learn values and grow. It's a tale of love, discipline, and change.
There could also be themes related to the magical aspects of her pregnancy. Since Nanny McPhee is a magical being, her pregnancy might have some special or unexpected magical consequences. For example, the unborn child might have an influence on the magic around the household even before being born, or Nanny McPhee's powers might change in some way during her pregnancy.
One idea could be an OC who has a special talent for music. The OC could use music to soothe the unruly children in the story, much like Nanny McPhee uses her magic. For example, when the children are about to have a big fight, the OC plays a soft melody on a flute and they all calm down.
A believable OC should have flaws. Let's say your OC is overly confident in their abilities. This could lead to problems when they try to solve the children's issues. They might think they can handle everything easily but end up making things worse. Their growth throughout the fanfiction is also important. As they face challenges, they should learn from their mistakes and become a better person, just like the characters in the original Nanny McPhee story.
Another option is FanFiction.net. However, the quality can vary a lot. Some stories might be really well - written, while others not so much. When looking for Nanny McPhee pregnant fanfiction there, you might need to dig a bit deeper and read the summaries to find what you're interested in.
Katharine McPhee has a very interesting love story. She got married to David Foster. Their relationship developed over time, starting from their shared interest in music. They supported each other in their musical and personal growth, and their love story is one that many fans find inspiring.
As far as I know, there isn't a well - known 'nanny by 911' story in general popular culture. However, in local communities or among certain groups, there could be individual stories that are known where a nanny had to call 911, but it hasn't reached a level of being a famous story on a large scale.