Its normal for eggs not to rupture in few of the cycles. Additionally not all cases of egg rupture can be seen on ultrasound
. Sometime what you see is not unruptured egg but the corpus luteum
. (Which normally forms after the egg is ruptured). Still some cases of repeated cyst formation(egg not getting ruptured) might be due to either endometriosis
or adhesions around ovary. Both can be diagnosed by laparoscopy
. If you are very anxious, you can go for laparoscopy.