ok well i'm gonna tell you you dont always gain weight when ur preg..i lost 5 lbs the first few mos off and on w my daughter and from one appt to the next w my i would lose about 10 lbs then gain it back up till like the 5th mos. the weight loss and gain can be caused by sickness throwing up alot or not being able to eat b/c ur sick then having a day or two where u can eat. just talk to you dr about it and see whats going on.