A miscarriage is the loss of a fetus before the 20th week of pregnancy. The medical term for a miscarriage is spontaneous abortion. As high as 50% of all pregnancies end in miscarriage -- most often before a woman misses a menstrual period or even knows she is pregnant. About 15-25% of recognized pregnancies will end in a miscarriage. More than 80% of miscarriages occur within the first three months of pregnancy. Miscarriages are less likely to occur after 20 weeks gestation; these are termed late miscarriages.
Recurrent miscarriage is when there are 3 consecutive losses and occurs in 1% population. It need investigations for thrombophilias, autoimmune diseases, Uncontrolled Diabetes or any uterine abnormalities. If any concerns, then investigations can be started early.