Tee hee Nets - I just had a visual of you sitting there scratching one hand with the other whilst simultaneously scratching one foot with the other! Sorry! I've had a similar thing from time to time, mostly on the bottom of my feet. I've put it down to increased sweat from the heat and edema. My hands I've just put down to my skin getting super tight and stretching which causes itching. It could just be your skin stretching (especially if you're getting swollen hands and feet due to the heat). I know you haven't started any new products lately but our skin becomes more sensitive during PG and so even products we've used for ages might become an irritation for our skin.
Have a chat to your doc next time you see them (or call if you're worried) just to make sure it's nothing else. In the mean time, cold compresses, rubbing vinegar on the spot, calamine lotion etc are all good ways of trying to keep the itch at bay!

HTH
MG