The Ob told me it was just extra fluid in my body caused by the pregnancy. I had never had any issues in my other pregnancies so I was a little worried. He told me it was nothing to worry about and it would go away after Bub was born. So after a few days after having Annie, and it was still there and I felt getting worse, the midwife told me it is a similar thing only it was now the fluid leaving my body but making its way to my extremities first... my fingers were swollen then too. I was told to put my feet up, to get it massaged, cool compress etc... none of it worked for me. After almost 3 weeks of dealing with it we remembered hirudoid cream helps with swelling, bruises etc and we got that which fixed it for me.
I hope the swelling eases for you soon.