If you are not pregnant, it is recommended that you have a gynecological ultrasound to check the endometrium for submucosal fibroids, endometrial polyps or excessive hyperplasia of the endometrium. If you are pregnant, we suggest you to have a gynecological ultrasound to check the condition of the endometrium and see if there are any submucosal fibroids, endometrial polyps or excessive endometrial hyperplasia, which can lead to irregular menstruation. 3.