It is likely the your babies may have been pressing on your internal organs causing you the symptoms of a UTI.
If you feel these symptoms again, do get checked out as it now may be a urinary infection.
You may even have kidney stones.
Make an appointment to get checked out by your doctor and ask if a blood test can be done to check your kidney and liver function.
In the mean time, ensure that you drink plenty of water. 2 litres a day is usually recommended, more if you sweat a lot.