Fi makes a really good point about food: I used to stash bananas and little bags of nuts around the place so I could always have a little energy fix if I got that hung over morning sickness feeling in the first tri. And in my second tri I was always STARVING and got cranky/dizzy if I didn't eat little and often. I think this is relevant whatever job you do!

Fi is also right about your belly sort of hurting/aching through standing/walking a lot. In my 3rd tri I found myself planning my day very carefully to minimise walking/standing.

And of course, that was at the same time as I subconsiously perfected that lovely pregnancy "waddle" which seemed to get a lot more pronounced if I was really tired, and I always knew when this happened as the crew would start making "Quack Quack" noises!!!!