All bleeding that occurs in the early weeks of pregnancy is referred to as a threatened miscarriage. Viability is uncertain in about 10% of pregnancies. Under 7 weeks a diagnosis can be difficult. When a miscarriage is suspected, an ultrasound scan is carried out to establish what the likely outcome will be. If it is confirmed that the pregnancy is not continuing, the scan findings will suggest whether there is a need for further treatment. Some women miscarry completely and the womb or uterus will appear empty when scanned. In this case, no follow up procedure will be necessary.