One misunderstanding surrounding TAC is that it increases the risk for miscarriage. This is entirely false based on decades of patient outcomes.
Pregnancy loss with TAC is rare; however, it is possible. TAC protects against loss by incompetent cervix, but not against a genetic miscarriage during the first trimester.
If a first trimester miscarriage occurs, the tissue can pass spontaneously because the TAC does not narrow the cervical canal. Otherwise, misoprostol may be used to help expulse the tissue, or a D&C can be performed without any impact on the effectiveness of the TAC in subsequent pregnancies.
Additionally, TAC does not prevent pregnancy loss due to:
Infection (in rare cases when the cervix is extremely short at the time of TAC placement)
More common pregnancy risks, such as preeclampsia, gestational diabetes, hypertension, placental abruption and birth defects.