I am going through the same thing right now, I am 35 weeks pregnant, going in today to discuss the issue..
Try a homemade oatmeal soap bar..that's what u use when my skin gets itchy and it seems to help
Also whenever u can keep ur feet elevated to prevent any swelling...hope u find some relief can only imagine how much that is driving u crazy!
I had itchy hands and feet with my first to the point I caused bleeding I scratched si hard, turns out I had obstetric coliostasis. Make sure you get checked for it, it is manageable but won't go away until baby is born, and you'll need monitoring. Best of luck, hope it goes away soon!