<s>[INST] hello, this is payal 27 years old, its 3 years i have been married n trying to concieve from 8 months. i consulted a doctor and i was told to under go follicular ultrasound scan. i have got it done on 10th day, n 12 day day from my periods and for the 3rd scan they have told me to come on 16thday ...... but i feel i need to go on 14th day wht is correct?? [/INST] Hi.As per textbook we need to go during the mid cycle, but may be the 12th day of your cycle, the scan revealed either too small a follicle or not obvious enough a follicle which is why it might have needed 4 days for it to mature enough, so follow your doctors orders and report on the 16th day, or you may have to go for the 16th day scan again after the 14th day scan (by choice).Best wishes. </s>