If you have yellowish leucorrhea in your first month of pregnancy, you may have a mild case of bacterial vaginitis, which is mostly self-healing, so you can observe it for a while. However, if the leucorrhea is yellow, accompanied by vulvar itching, high volume and odor, it is not normal and may be vaginitis. You should go to the hospital as soon as possible for a checkup, which is a test of the leukorrhea, and treat it with medicine according to the results of the test. Especially in the early stages of pregnancy, if you have vaginitis, it can have an effect on your pregnancy and may cause a preterm miscarriage or stop the development of the embryo. You should not abuse drugs when you are pregnant, so you should only use them after the pathogen is identified.