with my first one I lost 52 pounds she came a month and a day early

I read that in an email from What to Expect and it said it could cause preterm labor. But everyone is different and if your doctor doesn't seem concerned, you're probably fine. Maybe it's just the people at an unhealthy weight that are at risk. I wouldn't worry about it :)

No i only gained 12lbs n i had my daughter at 41wks 5days