What is the reason for not being pregnant?

Clinically, the main reasons for the postponement of menstruation are as follows: First, for women with a history of sexual life, blood HCG must be checked to rule out the possibility of pregnancy. Secondly, it may be because of work and life pressure, mental stress, cold, fatigue, strenuous exercise, excessive weight loss, changes in living environment, etc., may cause the postponement of menstruation. once again, endocrine disorders, such as abnormal ovarian function, hypothyroidism, etc., can also cause delayed menstruation. Specific reasons, we need to go to the hospital for related examinations, according to the results of the examination to make a clear diagnosis, better symptomatic treatment.