8lbs 5oz is pretty average size. That nurse has her own problems. Tell the doctor, she should not be scaring people like that and the doctor should know she is giving medical fear advice. Maybe you can request that she not be a nurse for you anymore rather than switching doctors. The office nurses are not the ones that are there for delivery.
I was in fantastic shape and at 5'8" weighed 135lbs (19%BMI) as a dance teacher and performer with my first child. ESP weighed 7lbs 15oz. I had to stop teaching when he was almost 3 because he has special needs and needed me more than my dance students. From age 43 to 45, I started to put on weight even with starting to really exercse again. I figured it was menopausal weight gain. I had started to get myself back into dancing basics and healthier living to combat that. Then I found out I was pregnant - and that the Change of Life Baby is no Myth.
I have so many food aversions and so much morning sickness, I have had to work hard not to lose weight and to just maintain. I did start this pregnancy overweight (184lbs/ 5"8' or 27% BMI = wieght in lbs divided by height in inches) and during my first tri-mester my doctor wanted me to gain about 1/2 pound a week only but really didn't mind that I didn't gain that. Morning sickness gettting a bit better.
I am more concerned with nutrition at this point. I cannot bring myself to take my prenatal every day. On the days I cannot I try and do a chewable prenatal. It may not fave iron or folic acid but has to be better than nothing. But occasionally, I cannot even stomach that.
I can eat fruit in small amounts, excluding bananas. Vegetable became a no go after throwing up salad. I do try and at least eat some cooked veggies every few days despite the grossness. I really miss veggies. I was doing gluten free bread but that started making me sick. I did saltines until I got sick to many time with them. Then switched to Ramen noodles, but that went down the toilet a week and a half ago. Now it is english muffins and bagels. White bread is not very nutricious but seems to be one of the few things that eases the sickness. I add cheese when I can bear it for calcium. Milk even soy milk is a no go. I can eat red meat but not white (chicken or pork) sometimes.
I do drink plenty of water. Seltzer helped for a while but now I can only stomach it occassionally. I let myself have a coke zero every few days when morning sickness is pretty bad because it seems to help. I limit to 20 to 24oz to keep the caffeine in check and really try not to do it more than one day in a row.
I have been chomping on ice which can indicate an iron deficiency. The doctor drew blood and the amount of iron in my blood has dropped from a nice high number to a lesser one but is still within the normal range. That was a relief.
I worry about the good effect of my healthy diet from before morning sickness fading away as well as developing bad habits and cravings for bad for me and baby foods.
I even ate two McDonalds cheese burgers the other day. I was craving fiercely. I got them even though I do not support factory farming and usually show that with my pocket book. The craving over road my conscience. The bad thing was that they made me feel less nauseaus and sat well. Guilt! but want again!! Argh!