How does the lower abdomen have a feeling of falling and distending and menstruation is delayed

There are many reasons for women's delayed menstruation, common in diet, environment, mood, drugs, endocrine, etc. Occasionally, menstrual delay for a week is normal, it is recommended that patients observe for another two days, if there is no menstruation for more than a week, they can see a gynecologist for blood tests to clarify the cause.