Weight Loss

So to my knowledge I am about 6 weeks +4 . I'm very very overweight. Since finding out about the pregnancy around the end of September I've been nauseous non stop, day and night. Its hard to eat. I have no appetite but I eat when the nausea ease up some. On the 27th I weighed in at doc at 255 lbs. Now I weighed myself at home yesterday and it says 244. Everyday it drops almost a pound. Accurate or not....it seems like a big jump. Its definitely good for me to lose weight because I'm high risk for my blood pressure but I'm worried baby isn't getting the nutrients he/she needs. I don't see doc until the 27th of Oct.

Any advice on what to take or eat other than the prenatals to make sure baby is getting what is needed?

I can keep food down it just makes me more nauseous to eat which makes me not want to eat.