Hi, I think your follicle is not growing normally. So, the size of follicle is same on day 7 and day 12. You cam be having polycystic ovary problem. In this, ovulation doesn t happen normally. So, you may need some medicines like clomiphene for inducing ovulation and track your follicles growth by repeated ultrasound and when follicle is more than 17 to 18 mm, take injection for rupture of follicles. Be in contact with your husband for 2 to 3 days after the injection. Take progesterone for next 2 weeks after rupture is confirmed on ultrasound. Do a urine pregnancy test after that.. You can try like that for 3 to 6 cycles. Also get a thyroid profile and prolactin level done to find out if there is any other cause also. Discuss with your doctor regarding this.