I'm 6 weeks pregnant and in the past 2 weeks I have been feeling hot and cold at the same time. If I am not pregnant and not have a runny nose, I would think I have a cold coming. This affects me most when sleeping. I can't get comfortable. Some nights this woke me up at the middle of the night finding my hands are freezing cold whereas my back is sweating (all under the duvet). Any one have similar problem?