My pants wouldn't button up properly by the time I was 11 weeks, and now I'm 15 weeks I'm starting to look a bit pg (though probably to strangers I just look pudgy )
I started wearing maternity trousers this week and OMG it feels better (till then I was using one of those pregnancy button extender thingies - what ARE they called?? - that you clip on your usual trousers to give you more waist space).
From memory I popped a bit earlier with DS2 - there was only 12 months between pregnancies. This time the gap is 23 months, so guess my body had a bit more time to recover.