What is spontaneous abortion?

It is called miscarriage.

‘Miscarriage is the spontaneous loss of a pregnancy before the 20th week. About 10 to 20 percent of known pregnancies end in miscarriage. But the actual number is likely higher because many miscarriages occur very early in pregnancy — before you might even know about a pregnancy.

Most miscarriages occur before the 12th week of pregnancy.

Signs and symptoms of a miscarriage might include:

• Vaginal spotting or bleeding

• Pain or cramping in your abdomen or lower back

• Fluid or tissue passing from your vagina

The term "miscarriage" might suggest that something went wrong in the carrying of the pregnancy. But this is rarely true. Most miscarriages occur because the fetus isn't developing as expected.

Miscarriage is a relatively common experience.’

(Source: https://www.mayoclinic.org/diseases-conditions/pregnancy-loss-miscarriage/symptoms-causes/syc-20354298)

Below is the statistics of admission to labor and delivery ward from miscarriages, since most of the cases need to have D&C done to completely remove the remaining tissues in the uterus to prevent infection.

(Source:https://bmcpregnancychildbirth.biomedcentral.com/articles/10.1186/s12884-017-1620-1)