Welcome to HealthcareMagic. From the symptoms it looks like a vaginal infection
. During pregnancy
there are hormonal changes can reduce acidity in the vagina. Reduced acidity encourages the growth of bacteria that cause disease.
It can be due to bacterial vaginosis
, yeast infection or vulvitis. I suggest you to get an examination done from a gynecologist and get a culture of the vaginal secretion done.
Hope it helps you. Regards.