YANBU, I originally planned to go back to work when my youngest went to school, partly financial, then DH job changed within the same company and now he travels so much it is impossible for me to work, although the financial side is sorted.
Now my plan is to go back to work when my youngest goes to comprehensive school in 3 years, but something that still allows me some flexibility to be here for my DCs. I'm looking into attending a refresher course for my shorthand, as I've heard our local council are finding it difficult to recruit people who can do shorthand.
As for what I do when the kids are in school. I was on the pta, helping out in school but we bought a holiday let property, renovated it ourselves and now I do that one day a week. I'm CRB checked so I help out a friend who runs a nursery/playgroup when one of her staff is on holiday or sick. I walk the dog, attempt housework, cook from scratch and play tennis.
I get a lot of fun made of me by everyone (DH, family, friends) when asked what I do at a recent night out my BIL chipped in "semi professional tennis player", I was narked to say to the least but laughed it off.
Like others have said, this is my life choice, at the moment, and I'm loving every minute of it.
You've made your decision to SAH so enjoy your time with your DD, believe me it flies by.