I think alot of it is to with the fact that with the first one you have no other children to take care of, so you get to play "princess" a bit - sleeping in when you need it, sleeping during the day, molly-coddled by everyone around you etc.
Second time around you have a toddler to deal with who has needs and couldn't care less how you feel. Plus you don't get the extra sleep either.
.
I totally agree with u! I was the biggest princess when i was pg with Mya. Leon wouldn't let me do heaps of stuff & i basically got to sit around on my bum for 9 months hehe (hmm could be why i put so much weight on with her!!)

Second time round i felt like crap!. Mya didn't give a damn about how i felt LOL & Leon, well he knew i was capable of doing pretty much anything....bugger!