I was pg during summer as well, but thankfully not full-term pg (was due in May)
It was the worst summer ever though, and we had many days that were over 40degrees!
I felt like dying on many occasions, and moaned and groaned about it nearly every day I think. 8-[
We didn't have aircon either, so what I did before bed, and before any naps was to jump in a cold shower, then go and lie down on a towel on my bed in front of the fan - letting the fan dry me off.
I also frequented the shops and the library a fair bit for the aircon...
I'm actually surprised that I survived it to be honest, cause I certainly didn't think I would!