Carla, I am the mother of 2 and one due in December, and I am here to tell you, it can be done!
I think I am the only person I've ever seen waddling around the ring in maternity clothes, LOL...and I'll continue to do so until I can't get off the floor. (which by my estimation, wont be long! lol) I think yorkies and kids can be managed, and shows to me are an EXCELLENT escape from the rugrats! I grew up a "show brat" myself, drug from one show to the next my whole childhood, and though I hated losing weekends with my friends as I hit my teenage years, it was something that I will never forget, and left a love for dogs imbedded in me for life. Good luck with your pursuits, and just keep a "can do" attitude, and you will do great things!