There is a substance called fibrin in the human body. For women of childbearing age, it is an indispensable substance for the successful implantation of fertilized eggs into the uterine cavity. Once women lack this fibrin material, it is difficult to conceive. The contraceptive principle of the birth control ring is to destroy the fibrin in the reproductive tract, so that the fertilized egg cannot be implanted. For women with diabetes, the fibrin in their body can still participate in the fertilized egg in the uterine cavity. During the bed process, the placement of the birth control ring often fails to destroy the fibrin, resulting in contraception failure.

In addition, women with diabetes should not use oral contraceptives for a long time, because diabetes patients generally have varying degrees of vascular damage. Long-term oral contraceptives will further increase the risk of cardiovascular and cerebrovascular diseases.