You may be referred for an early scan because of vaginal bleeding or spotting, or possibly because you have had problems in a previous pregnancy. The best time to have a scan is from about 7 weeksâ gestation when it should be possible to see the babyâs heartbeat in a normal pregnancy.he ultrasound scan may show: 1  A viable ongoing pregnancy. 2  An ongoing pregnancy that suggests a problem. 3  A pregnancy of unknown location (PUL). 4  A complete miscarriage. 5  A non-viable pregnancy. 6  Missed miscarriage (also called silent or delayed miscarriage or early embryonic demise) This is where the baby has died or failed to develop but your body ...