I got one last month, told my ob and she wrote me a prescription for cream told me to wear cotton underware and said it would also help to sleep without underware on (thought it was weird but it helped)
Baking soda and salt baths and putting on diaper cream help I was told. See your doctor for treatment options
They are very common in pregnancy because the ph levels being higher. Try wearing cotton underwear and loose fitting pjs at night.