If it is the case that your period comes only a little and then it is gone, you must pay attention to it because of the following reasons: 1. First of all, rule out the possibility of pregnancy. If you have a normal sexual life and do not take contraceptive measures, it is advisable to collect morning urine for early pregnancy test and then rule out the possibility of pregnancy. The reason for this is that when someone is pregnant, there is also a little bit of vaginal bleeding at the time of menstruation, which is often caused by pregnancy. 2. Exclude the possibility of ectopic pregnancy. Patients with ectopic pregnancy often experience a small amount of vaginal bleeding when they are due to have their period. This phenomenon is often ignored by patients who mistakenly think it is a decrease in menstrual flow. It is advisable to go to the hospital for a blood test to rule out the possibility of ectopic pregnancy. In addition, if pregnancy and ectopic pregnancy are ruled out, this condition is likely to be caused by endocrine disorders. It is often caused by a sudden consumption of too much cold food or a change in the environment, which can also lead to this condition.