Undetected miscarriage: what to know

A miscarriage is a pregnancy loss that may sometimes be discovered before the body starts bleeding or cramping. Pregnancy symptoms can continue for a while, so how you feel cannot confirm whether a pregnancy is developing. A transvaginal ultrasound may assess the pregnancy location, development and heartbeat when appropriate. Dates can be uncertain, and one scan may not always provide a final answer; the care team may recommend repeat imaging or blood tests before confirming the diagnosis.

Ask the clinician to explain what was seen, whether the findings are definitive and what follow-up is planned. If miscarriage is confirmed, options may include waiting for the body to pass the pregnancy tissue, medical management with prescribed medicine, or a procedure to remove tissue. The suitable choice depends on symptoms, scan findings, medical history and your preferences. You can ask about pain relief, bleeding, emotional support and what to expect at home.

Seek urgent medical care for severe or one-sided abdominal pain, fainting, shoulder-tip pain, heavy bleeding, fever, foul-smelling discharge or feeling very unwell. These symptoms can signal complications, including ectopic pregnancy or infection, and should not be explained away as a miscarriage. Contact your maternity or emergency service if you are unsure how much bleeding is concerning or cannot reach your care team.

Ask whether another scan is needed, how the pregnancy location was confirmed, and which management options are available. Ask when to return, which symptoms require urgent help, how to manage pain, and what emotional support or follow-up is offered.