Spontaneous abortion (SAB), or miscarriage, is the term used for a pregnancy that ends on its own, within the first 20 weeks of gestation.
Studies reveal that anywhere from 10-25% of all clinically recognized pregnancies will end in miscarriage. Chemical pregnancies may account for 50-75% of all miscarriages. This occurs when a pregnancy is lost shortly after implantation, resulting in bleeding that occurs around the time of her expected period.
During the first trimester, the most common cause of miscarriage is chromosomal abnormality – meaning that something is not correct with the baby’s chromosomes. Most chromosomal abnormalities are the cause of a damaged egg or sperm cell, or are due to a problem at the time that the zygote went through the division process.
In a few cases, a mother's health condition might lead to miscarriage. Examples include:
Uterus or cervix problems
Threatened miscarriage. If you're bleeding but your cervix hasn't begun to dilate, there is a threat of miscarriage. Such pregnancies often proceed without any further problems.
Inevitable miscarriage. If you're bleeding, your uterus is contracting and your cervix is dilated, a miscarriage is inevitable.
Incomplete miscarriage. If you pass some of the fetal or placental material but some remains in your uterus, it's considered an incomplete miscarriage.
Missed miscarriage. The placental and embryonic tissues remain in the uterus, but the embryo has died or was never formed.
Complete miscarriage. If you have passed all the pregnancy tissues, it's considered a complete miscarriage. This is common for miscarriages occurring before 12 weeks.
Septic miscarriage. If you develop an infection in your uterus, it's known as a septic miscarriage. This can be a very severe infection and demands immediate care.
Emotional healing can take much longer than physical healing. Miscarriage can be a heart-wrenching loss that others around you might not fully understand. Your emotions might range from anger and guilt to despair. Give yourself time to grieve the loss of your pregnancy, and seek help from loved ones.