I was size 12 pre-pregnancy, and uber-healthy - didn't drink, didn't eat wheat, dairy, sugar, exercised regularly, lots of yoga.
Didn't put on excessive weight over the pregnancy, but started to pile it on post-partum - I was so tired that I didn't care what I ate, and ended up troughing cake most days, and was back on the carbs big time.
I am now 2 stone heavier than I was in 2006, size 16, and pregnant again. MS is a problem this time, so I'm eating whatever I can tolerate but can see the weight piling on.
I intend to tackle it this time next year, when DC2 will be about 6 months. I'll probably do Slimming World or something similar.
It is mighty depressing I have a wardrobe full of beautiful clothes that I put away during my pregnancy, only to retrieve after DS was born and discover I couldn't wear them. Now it's time to pack them back up again and get out the maternity stuff. I only hope I'll be able to wear them again one day - tis a good incentive!