Thank you for your query.
The swollen and painful vagina indicates a vaginal infection
in addition to a urinary tract infection
You should consult your doctor, and have a vaginal swab , specially for streptococcus
or any other severe infection.
Keep the area clean and dry.
Do not wipe / rub / clean vigorously.
Have your blood sugars tested.
Also, contractions in absence of pain are usually Braxton Hicks contractions
, which are harmless, and are preparatory for labour.
If the contractions cause pain, please visit the ER, as infections can lead to preterm labour , more so in twins.