Get checked for kidney stones. I am a medical assistant and had experience first hand with stones with pregnancy. They can do a renal ultrasound sometimes they can see them that way. If it gets real bad it can completely block off the kidney and make the person septic. Although back pain is common in pregnancy it is normally the entire lower back. Your description of the area sounds like kidney location.
Will it harm my baby at all?
I think ive had a water infection over the past 2days but i didnt go doctors i just drunk cranberry juice and its seemed to help ive had a private scan today but this pain only came on tonight but shes still moving and everything