I have had several stents for kidney stones but none while pregnant (thank God!). I think they are painful! Not as painful as the kidney stone, but still.
Do your urologist give you any medicine to take? I was always given pain meds but also medicine specifically for the stent. I think they were to prevent bladder contractions. If you don't have anything like that, please ask.
My doctor gave me instructions about drinking lots of fluids and cutting back on activity. I was not to lift my kids. Please tell me with 2 year old twins you were told you could not lift them! The activity will increase all of your symptoms and possibly even cause visible blood in your urine.
Another thing that might help. If you feel, even a little bit, like you need to go, go right away. If you have to wait, you will be in pain. the pain will begin in your crotch and can even go up into the kidney until you empty your bladder. No fun!
I am so sorry you're going through this. Try to ask lots and lots of questions during your next visit. I really hope they can do something to make this easier for you.