Hi Gain-a-baby,
There are many opinions on do's/donts during pregnancy - most of which has not been scientifically proven to be bad. Thus, everyone is free to decide what is best for them.
However, I do think avoiding house chores / basic everyday tasks is taking it a bit to the extreme, unless you have a high risk pregnancy and there is a medical exception.
This is my second pregnancy. With my first I sanded down our entire house's wooden flooring, painted the whole house and carried on with basic tasks as normal. My healthy daughter is almost turning 2 now and I had a perfect full term pregnancy with no complications whatsoever.
Now with my second pregnancy I can definitely not avoid picking her up on a daily basis. i think the key here is good posture. Trying to keep your back as straight as possible and use your LEGS (by bending your knees) rather than your back muscles for these tasks.
It probably also depends on the type of person you are. I am quite active and I think I would go insane if I had to do nothing for 9 months!
In my opinion, I think the working women of today has become very spoilt with domestic services (including myself). I have read a pregnancy book which was published around 1980 where they have pictures of how to iron, do washing, mop floors ect using the correct posture
Then with regards to a daily walk. This is almost a must for any pregnant woman - especially if you want to give birth vaginally! keeping fit is not only good for mommy, but for baby too! Just keep it light and dont start boot camp at this time

Also avoid jumping excersizes (such as skipping rope) and sit-ups.
Other than this.. I think that the stress of worrying about what is allowed/not allowed is worse for the baby than the actual task!