So, I think my body thermostat is broken

It's not hot in Melbourne, but it's not cold. And all day, I am freeeezing.
I could be wearing thermal underwear and woolly socks, freezing.

BUT if I dare put a jumper on, or snuggle under the covers for warmth... or near DH because he is stinking hot... I feel like I need to strip down!

I don't understand?!!

I know most heavily pregnant women struggle through Summer (Lord knows I did with DS) but is this a pregnant thing or am I broken? I do normally run colder but not this bad!