I have always been 5'2", and I'm way after the age range for height growth. (I'll be 41 in a few months.)
This past spring I had to measure myself for a costume and I was, very surprisingly: 5'3"! Now, that's only one inch compared to your three inches, but it is possible that it was from the pregnancy... I honestly don't know what else it could be. Other than maybe Yoga, but I've been doing yoga since '93 and it had never caused any height increse before. And I've been very neglectful of my yoga practice these past few years.
I should mention that my feet remained their normal size through out the prenancy and although my butt and chest got bigger they've mostly gone back to Pre pregnancy size.
-- Miss 1928 -- and Opera Singing Mamma to Eloisa -- 12 Feb 2007
-- Wife to a Wonderful Husband and Pianist -- 27 March 2003