Well, I've had all singleton pregnancies, all girls, and I can tell you that each one has been a little different. Wasn't terribly sick my first time around, a bit worse the second time. Had severe reflux from before the BFP the 3rd time around and much worse MS. This time the MS started 2 weeks sooner than with any of my other pregnancies, but has been a bit milder than last time.
I don't think it necessarily means anything, it just is. Each pregnancy can be very different.
Alisha, Army wife to Nathan , Homeschooling mama to Scheeli (May 2003) , Bronwynn (Nov. 2004) :, Piper (Nov. 2007) , and Wesley (January 2010)