It could be something to do with your liver that's what they told my friend you should call your doctor tomorrow and ask if you can be seen and get them to do tests to make sure it's not anything to do with your liver
I'm having the same thing I'm in my third trimester and doctor said it's something to do with my liver giving off slats and that it nothing to worry about it'll go away when baby comes. I had my galbladder removed when I was younger He said that's usually the reason why.
My skin got super dry and itchy in my first trimester. I started using body oil instead of lotion and that helped a lot