I was dehydrated and wasn't eating enough( due to sickness) and I lost 13 lbs. At nine weeks I had to see my Dr because I knew something was wrong. She told me that at this point I should be gaining a lb a week and I've lost too much. Weight gain is a sign of a growing baby. I had an ultrasound and thank the lord my baby is very healthy! 30 lbs is excessive.
I am 33 weeks and have lost 11lbs. As long as your baby is growing then you should be fine. It Also Depends On you, If You Were Over Weight to begain With then It may be nothing