I am so lucky to have such a wonderfully multifaceted job. I do multidisciplinary research built on my physics background, which means I learn about new things every day and work with a wide range of people with completely different outlooks and working styles. I also get to teach physics to undergraduate students, and that just gets more enjoyable the older I get.
Now, with my youngest daughter reaching adulthood, I am happy to say that I have no regrets about having been a working mother. Maybe (?) it would have been nice to spend a little more time at the school gate, but now my daughters are generally happy and confident, and we share things that we couldn't have done if I hadn't worked.