Jade, tumors of the bladder can occur inpatients of your age but that would be an extremely rare instance. Ultrasound(US) of the bladder may demonstrate a mass "effect". This can either be due to something inside the bladder(such as a tumor or stone) or something pressing on the outside of the bladder causing an indentation that resembles a bladder mass. Most often, the latter is due to stool in the colon pushing on the bladder wall. I would suggest that you see a urologist in consultation. Get a copy of the US and take it with you. The urologist may decide to repeat the US or just to do a cystoscopy to clarify the problem with certainty. A cystoscopy is a direct examination of the interior of the bladder with a small, flexible lighted instrument. It can easily be done in the office, takes about 5 minutes, does not require anesthesia and is not contraindicated by your pregnancy. Statistically, the likelihood of you having a tumor is small but you need to see a urologist to determine what is causing the bladder abnormality on US. Good luck.