Pregnant during summer... help!

Lily • 💕20 and pregnant with our first baby! I'm a bit of a princess at times💕
It's getting hotter and hotter in London at the moment, and I'm constantly out of breath and tired. What tips do you have on staying cool during pregnancy? 
Cold foods really upset the baby I think because he kicks a lot whenever I eat something cold, so I try to avoid that.
Is there anything else I could try while out and about?