What are the symptoms? Before your body expels the decidual cast, you may experience bleeding, spotting, and abdominal pain or menstrual cramps, which may be severe. When it's expelled, a decidual cast will be red or pink. It will be somewhat triangular and close to the size of your uterus.

How common is decidual bleeding?

2 Decidual bleeding does occur in some women but is fairly rare. Implantation bleeding usually lasts only a day or two. So seeing a doctor is your best bet for ruling out miscarriage and figuring out the reason for your bleeding during pregnancy.

Can decidual bleeding be mistaken for a period?

Decidual Bleeding

This most closely resembles a normal period, as it coincides with the time you'd normally have your period and is also a similar inflow. People who experience decidual bleeding can feel like they've had a regular period because it is so similar.