Definitely drink lots of water. Where I work it gets hot too. You're still pretty early so it shouldn't be too terrible yet but once I hit around 25 weeks it gets harder to breathe as the baby is pushing everything up and not as much room for your lungs it will be tough. There's some nights I thought I was going to pass out. I just told my job I can't work in that particular area all the time. Hopefully they'll be able to accommodate you.
If you could do it before you were pregnant you can do it now. Stay hydrated.
Yeah!! That is not good for both of you.!!