Hi, I am a 29 year old woman. I usually have a 30days menstrual cycle. But this month, l have missed my periods by 15days. I have done urine pregnancy kit test & serum hcg test, but its negative. I also did an ultrasonography (about 5 days back) , its report states that endometrial thickness 15 mm, dominant follicle in right ovary & rest normal. I have lower abdominal pain for past 16-17 days. What should l do to have my periods? Kindly oblige me with your advice