Stevie that sounds really uncomfortable! I get that sometimes in summer too - down in Adel at the moment I am more likely to get chill blains than chaffing.

One thought is are you wearing a panty liner to reduce the sweatyness down there? In pregnancy we get more fluid and swollen down there and panty liners help with that. Sorry, not something I would normally ask a woman I dont even know!

Also, can you wear shorts or loose cotton trousers to reduce the contact between your thighs? It will still rub but not so much if it isnt skin to skin.

There are some products around for chaffing too - creams and talc's that you could check out for use during pregnancy. I guess you want to get on to it pretty quick as its only going to get hotter.

Good Luck!