thanks for the query.
Yes, at midcycle around day 14, the size of the follicles should be atleast 20 mm.
Small follicles indicates failure of ovulation , pointing towards polycystic ovarian disease
Your gynecologist would have the complete sonography
report , and hence the diagnosis would have to be made.
, alongwith sonography, various other investigations are required to decide the severity and the management.
So, please go for the full hormonal
evaluation as advised by her in your next cycle, and then proceed with the treatment.
PCOS could be the reason for your inability to conceive inspite of trying, and if you do have PCOS, you will need extra medicines to help you ovulate/conceive.