It took me 6 months + to start firming up. Excercise like walking and pilates is good for toning tummy!

I think you'd be better to yourself if you buy some cheap clothes that you can wear to work in the meantime, than trying to squeeze back into your old ones. It would be more upsetting to have the muffin top spilling out of a 10 than to wear a 12 IMO.

Even if you lose weight, your shape can change and they may not fit you right again anyway. I found that to be the case for me, because even though I weighed less 12 mths later then before I got PG my hips and ribs had been pushed out so my size was different