If one more person says this to me I'm going to scream.
I'm pregnant with dc2 and strangely enough I have to get on with my life. That includes doing stuff like moving boxes, going into the loft (and climbing the ladder) and painting. Sometimes I have to carry my older child for varying lengths of time. Or get the shopping in which can include heavy items. All normal everyday stuff - I'm not trying to get on rollercoasters or go parachuting!
However I am an ADULT and therefore able to make decisions about my physical limations without having to be reminded that I'm pregnant (as if I could forget!). If I judge something to be beyond my limitations then I won't do it, same as if I wasn't pregnant.
I know this is probably old news but it's something I've noticed in the media and in life in general too; pregnant women are seen as vessels for the baby first and as people in their own right second. It especially irks me when these comments come from people who will never be in the position to put themselves second to another human in the same way a pregnant woman is expected to.
Phrases such as "You can't do (insert taboo behaviour here e.g: have an alcoholic drink, eat the "wrong" food, go running etc) in your condition!" Should also be banned imo. Anyone can do these things. Maybe some people shouldn't do these things, but that is not for some random person to dictate to another adult.