I have been bleeding in cerazette after 5months no bleeding, what to do?

Desogestrel only: Cerazette is a pill that only administers a small amount of desogestrel only, no estrogen. Your own estrogens may have stimulated the inner lining of your uterus to a point, where the desogestrel is not strong enough to keep it from being shed, which is the breakthrough bleeding. A pelvic ultrasound to determine the endometrial thickness may be useful before trying other hormonal therapy attempts.