I'm sure lot's of people are going to disagree with me on this one but here goes....My husband and I own two wine shops and I worked in them until one week ago ( I am 30wks) lifting all the time. Near the end I found it harder because of my size and because I was front heavy and my balance was different. I think that if you are in good shape to begin with and you don't lift in a way that would injure you even if you weren't pregnant you should be fine.
Sushi has no higher levels of mercury than cooked fish, although certain species are higher than others. the reason there is concern over pregnant women eating sushi is because of the risk of food poisoning. My midwife put it to me like this..." You wouldn't eat sushi that you thought was going to give you food poisoning to begin with would you?". My answer (of course) was "NO!". "Then any sushi you eat should be from a source that you trust and it should be very fresh. When you have established that, eat as much as you want, it is good for you!" Remember that sushi is great for you when you aren't pregnant so why should that change now? The omega 3 oils in fish help combat what they call 'baby brain' as they are used in the production of brain cells that the baby will take out of your body if you aren't supplying enough of it in your diet. Baby Brain is when you start losing memory, and just feeling kind of clueless sometimes and it seems to happen to almost everyone. My husband thinks it is highly amusing
As for the alcohol....well there are many conflicting or should I say just plain different opinions on this subject and I think it just needs to be a topic that you decide for yourself after as much information as possible. I have noticed that it seems like every health care provider will tell you that any alcohol you consume before knowing you were pregnant is fine. Especially in moderation. I think that most (if not all) cases of FAS are in children born to ALCOHOLIC mothers. In other words, women with serious drinking problems.
I know it is hard not to worry and you want to do the best for your baby, but I think that if something is going to happen (like a miscarriage, or chromosomal disorder), then it is going to happen no matter what. Hopefully the ultrasound will put you more at ease and you can try to enjoy being pregnant. Remember, women have been doing this since the beginning of time.