Hi, One of the reasons this happens is that your body requires more fluids during pregnancy. This can cause the vaginal tissues to be drier than usual. This can lead to itching and even soreness and you may find if you scratch, it gets worse.Another cause is excessive sweat that can collect in the crevices around the vulva, creases of the legs and entrance to the vagina. Warm moist areas can get irritated easily and cause itching. Consult Gynecologist for further advice...