How Did You Know You Had Decidual Bleeding How Common Is Decidual Bleeding Amoung Pregnancys?

How common is decidual bleeding amoung pregnancys? - how did you know you had decidual bleeding

At that time, such as bleeding (but not) your period when your hormones may be out of service. It makes the components of the layer along the uterine wall.
Do you already have them or know someone who has? and if so, why do you think that you are pregnant?