Hi S,
How are you?
I cannot really remember when I returned to my pre preg shape as I was only 8 weeks, I remember my boobs took about a month to go back to orginal size but stopped being sore immediately. My waistline took a bit longer too...
Don't rush into any exercise etc as you want your body to recover naturally... as soon as you get your first AF again it is a good sign that things will all settle again soon.
Take care honey.xxx