Some women's feet get bigger during pregnancy and stay that way, some get bigger and go back to their previous size afterwards, and some don't change at all. It is almost impossible to say which you might be.
My feet went up during pregnancy, but didn't stay that much bigger afterwards. I permanently went up about 1/4 to 1/2 a size, which just makes it harder to shoe shop because I need to buy some shoes bigger and some the same size. I was probably a full size up for a good 6 months after delivery, and then my feet started getting closer to pre-pg size again.
So you may be in flux as far as shoe sizes for for a while!
. Some women don't have any size changes - but you won't know until it's all over. On a positive note, the shoes I wore during my pregnancy all slowly stretched, so I can still wear those few pair. Other than that, I replaced all my shoes & donated my old ones. I have that & cable internet to thank for a closet full of almost entirely 'new' shoes (none more than 4 years old).
I don't know what I would do if I didnt' fit into any of my shoes anymore!
- LOL, I used to have about 20 pair pre-baby. By the time they were all too small, internet shopping had all grown up. Now I probably top out over 100 pair of fabulous mid-range shoes for any occasion. 
