Hi,
I am 20 years old and my periods are highly irregular..duration of 40 days are normal. I had an ultrasound done on 23rd day of my cycle and endometrial lining is just 3.7 mm. I had ultrasound done as was worried about pregnancy as periods are highly irregular. Is it possible that I might be pregnant with 3.7 mm lining or what should I do to make my periods regular.