If your kidney
functions are normal and no urine infections, there is nothing to worry.
Horseshoe kidneys themselves do not have any affect on pregnancy
However some persons with horseshoe kidney have abnormalities in the drainage
system. During pregnancy there is a tendency for urine to flow backwards from the bladder to the kidney. This can increase the chances of UTI.
No specific measures are required. Check your Blood Urea, Creatinine
and Urine routine. Take adequate fluids.