I Have Had A Kidney Stone In The Past And

I have had a kidney stone in the past and the pain i feel now feels like it right before i found out i had one. It feels like a uti but i have been tested every time i go to my appointments and they have told me it isn't. Its not a yeast infection either or contractions either cause it isnt a cramp feeling. It feels like a sharp imtense pain that kinda itches and burns. It was just when i walked but now.it had increased and is when i walk, sit, pee, ect. I am 38 weeks and want to make.sure whatever it is wont effect the baby