According to my first ultrasound I am 28 weeks pregnant, every other ultrasound and my last period (started July 26th) would place me at closer to 30-31 weeks. I mostly tell people I am due in early May (though the doc said May 16th) just in case. Or I just say "about 3 months left!" but I am still confused by the whole thing, too. Don't sweat it, though, the baby will come when the time is right!