It's normal to have more vaginal discharge while you're pregnant. Healthy discharge is thin and milky in colour. It's not that different from the discharge you had before you were pregnant. There's just a lot more of it.
Sometimes the discharge becomes thick, white and creamy. You may also have itching, soreness or redness in or around your vagina or your bottom. It might hurt when you have sex or when you urinate.
This is likely to be thrush.
Thrush is caused by a fungus. Usually, it lives harmlessly in the vagina. You won't know you're carrying it. It only becomes a problem when it grows out of control.
You're more likely to get thrush if you're pregnant because the vaginal secretions are richer in sugar. This makes it easier for thrush to grow.
You may find thrush comes and goes while you're pregnant. Although it may take a while to clear up and be a bit of a nuisance, it isn't anything to worry about.