Hi Lisa,
I see you've already got the answer you needed but I just wanted to add that I too was in your position (pregnancy weight gain). 10 years ago I gained over 5st whilst carrying my first born. I'm also only 5ft 3" myself and it put a lot of strain on my back, etc. so I completely understand.
Just wanted to wish you the best of luck for when you start CD. I know you want to start as soon as possible, but like the other posters advise, preparing yourself so you don't feel a big shock to your system will be a great way to focus on the positive rather than feel disappointed that you have to wait a little longer, and you'll more than likely lose some weight in the process.
I lost my 5 stone without a 'diet' as such and I'm using CD to get rid of my last stubborn stone so if you'd like any advice give me a shout.
Good luck!
Xxx