If you miscarry, it’s important to know that it wasn’t linked to anything you did, such as exercise, sex, or travel. Also, there is no evidence that rest reduces the risk of a threatened miscarriage going on to become inevitable. If you have two or more miscarriages in a row, known as “repeated miscarriage,” your doctor may arrange tests to see if there is a cause. About half the time, no cause will be found but sometimes testing will find fetal chromosomal problems, uncommon uterine problems, or blood disorders or other medical conditions.