Usually odor is not a precursor to pregnancy, but may be a precursor to gynecological diseases. It is recommended that women should go to the hospital for a timely examination to understand the cause of the odor and to develop effective treatment under the guidance of a doctor. Normal vulva or leukorrhea does not have odor, but if odor appears, it means that women may have inflammation in their body, such as vaginitis, cervicitis or uterine fibroids, etc. The above diseases can cause abnormal vaginal discharge and produce odor. Precursors of pregnancy usually include the appearance of mild lower abdominal pain, breast tenderness and other manifestations, similar to PMS. If a woman has passed her menstrual period and is accompanied by the above symptoms, pregnancy is highly suspected. If the test is negative, it is not certain that there is no pregnancy, because the accuracy of pregnancy test is low. When the concentration of HCG (human chorionic gonadotropin) in urine is low, the test may be negative or weakly positive. Further testing combined with HCG in the blood is needed to clarify whether a woman is pregnant or not. If the blood HCG is elevated in a large amount, it can generally be confirmed that a woman is pregnant. In daily life, it is recommended that women should pay attention to personal cleanliness and hygiene by washing the vulva daily and changing underwear regularly to help relieve odor. The diet should be light and easy to digest, avoiding greasy, cold, spicy and stimulating foods. If the odor persistently worsens, it is recommended to go to the hospital in a timely manner and not to use medication on your own to avoid delaying the condition.