Estrogen in the body increases with the progress of pregnancy. Estrogen has the effect of promoting the secretion of cervical glands and endometrial glands, which increases the amount of vaginal mucus, and the rich blood flow in the pelvis during pregnancy has the effect of promoting the secretion of cervical glands and vaginal mucosa, so the leucorrhea is more than before pregnancy, and it is milky white and odorless, like egg white, which is a normal phenomenon and generally does not need special treatment. The leucorrhea-like secretion is more, often leaving the vulva in a moist state, but there is no other discomfort, there is a certain stimulation of the local skin, pregnant women usually pay attention to personal hygiene, choose comfortable cotton underwear, often wash the vulva with water, change underwear regularly, keep the local dry and clean. If there is an abnormal change in the color, quantity and quality of the leucorrhoea, it is called leucorrhoea abnormal, and you should go to the hospital for a gynecological examination, most likely for mycobacterial or trichomonas vaginitis. Mycotic vaginitis, infected by contact, increased leucorrhea in the acute stage, white beanbag-like or curd-like, itchy vulva, mostly starting from the inner labia minora, then spreading to the vulva, affecting work and sleep when serious, sometimes accompanied by burning pain, may have frequent urination, painful urination and pain, long-term application of antibiotics, diabetics are prone to this disease, after examination to find Candida albicans, can be diagnosed as mycotic vaginitis. Trichomonas vaginalis, there is direct infection or indirect infection through bathtub, bath towel, swimming pool, sitting toilet, etc. The leucorrhea is increased, grayish yellow thin foamy, occasionally bloody or purulent, with fishy smell, with vulvar itching or insect crawling feeling, there will be burning, pain and pain, if the urethra is also infected, there are symptoms such as frequent and painful urination, you should go to the hospital for examination, trichomonas can be diagnosed by finding in the secretion Trichomonas vaginalis should be diagnosed by detecting trichomonas in the discharge, and should be treated regularly under the guidance of a doctor.