Hello Sir, My Wife Age 26 Year Old, She Has

Hello sir, my wife age 26 year old, she has fell pain in her back. She had miscarriage in December 2014. Doctor found the main reason of miscarriage is rubella in February 2015. Doctor prescribed a vaccine of rubella. Doctor told for conceive after six month of vaccination of rubella. From form November 2015 we are trying for conceive a child but we become failed. My sprem report is normal. In November 2015 the ultrasound report is totally normal.
But in April 2016 my wife's ultrasound report shows a floating cyst in vegina. Sir please tell now what we do.