Am 27 yr working, married woman and diabetic for 3yr. Am on obimet sr 1gm before lunch and dinner. I have recently conceived. And doctor has started insulin. My last date of period was 11.06. 2015. According to TVS pregnancy the baby is 6weeks 4days old, bt, according to period calculation it should be 8weeks 2days. The doctor says it's a 12day lag. What does it mean? does it mean any abnormality? is the baby normal? please tell me.