Congratulations, ladies! How exciting for you!
I've never been pregnant, but I have a few stories that might give you a picture of how everyone's different.
My mother-in-law--never had morning sickness with her first three (all boys), but she knew the fourth was a girl because she was really sensitive to food smells and would sometimes throw up for no reason.
My sister never had morning sickness and ate like a horse all the way through the pregnancy. She even out-ate my husband when we went out for pizza!
She did find out the sex ahead of time so that people could prepare and buy certain things. They didn't name him until he was born...while she was pregnant, she just called him "Junior."
My best friend was severely ill with both of her kids, kind of an all day sickness. She lost 30 pounds in the first trimester with her frist child. After about three months, though, she was able to eat more and everything turned out great.
My mom--well, as my dad puts it, "She has puppies quick!" She had three of us, and basically each time was really fast. With the middle child, the doctor almost didn't make it into the room to deliver my sister before my mom had her. I hope you ladies are lucky enough to have quick deliveries!
Anyway, it just goes to show, everyone's different, and knowing that each experience is unique maybe makes it a little less scary. Keep us updated!