The most common time for something to go wrong with a pregnancy is in the first days and weeks after conception, when some abort.
It's thought that many early miscarriages go undetected. If your period arrives as normal you may never even suspect you were pregnant.
About one in six affirmed pregnancies miscarries, usually before 12 weeks. Most women who have one miscarriage go on to have a normal, healthy pregnancy next time.
If you miscarry at home, you'll need to see your doctor and may also have to go to hospital. In some situations, you may need an operation called a dilatation and curettage to be sure your uterus is clear.