Hot Bath - Cold Vagina?

Brit
So I have a weird question. I was taking a warm bath like I do every night. I am 38 weeks tomorrow. I always start running my bath water before I get in and it is always warm before I sit. 
So I was sitting there and the space right where my vagina is felt cool - like water of a different temperature. I moved and sat in a different spot to see if somehow it was just different temp water. But it was cool there too. 
I put my hand down there and didn't feel anything different - but my vagina felt like the water touching it was cooler. 
It's bizarre. Anyone know what this could be?