Blighted Ovum (Anembryonic Pregnancy): A Gentle, Honest Guide

• A blighted ovum (anembryonic pregnancy) is when a pregnancy sac develops but no embryo grows inside it; hCG can keep rising for a while, so tests stay positive.
• It is overwhelmingly caused by random chromosomal errors at conception, not by stress, lifting, sex, food or anything the mother did.
• Diagnosis is made on transvaginal ultrasound, usually with a repeat scan 7 to 14 days later to be certain before any treatment.
• There are three valid management options: waiting for natural passage, medication (misoprostol, with or without mifepristone), or a minor surgical procedure.
• After one blighted ovum, the next pregnancy succeeds about as often as for women with no history of loss; you can usually try again after your first normal period.
• Grief is real and deserved, even very early. Ask for clear answers, a second opinion if a single scan was inconclusive, and mental-health support if you need it.

After a sperm fertilises an egg, the tiny embryo implants in the lining of the uterus around 6 to 12 days later. The placental tissue then starts making the pregnancy hormone hCG, which is what a home pregnancy test detects. On ultrasound, the gestational sac becomes visible around 5 weeks, a yolk sac by about 5.5 weeks, and an embryo with a heartbeat by roughly 6 to 6.5 weeks.

In a blighted ovum, that sequence breaks early. The sac forms and may even keep growing, but the embryo either never develops or stops at a microscopic stage. Because the placental tissue carries on producing hCG for some weeks, the test stays positive and early pregnancy symptoms such as nausea, breast tenderness and fatigue can persist. By the time it is found, usually between 8 and 13 weeks by last-period dating, the sac is empty or contains only fragments.

The older name 'blighted ovum' is being replaced by 'anembryonic pregnancy' (literally, no embryo). Both terms mean the same thing. It is common: anembryonic pregnancy accounts for roughly a third to half of all first-trimester miscarriages.

The single most important fact about a blighted ovum is that it is almost always a random genetic event, not a consequence of anything you did or felt.

Around 60 to 75 percent of cases are caused by chromosomal abnormalities, errors in the number or structure of chromosomes that happen as the egg, sperm or early embryo forms. The embryo simply cannot continue developing, and the pregnancy stops on its own. These errors are largely chance. They become more common with age, which is why miscarriage rates rise gradually through the thirties and more steeply after 40, and a smaller share relate to sperm DNA quality, which can decline with male age and smoking.

Less common contributors include uterine factors such as fibroids that distort the cavity or a septate uterus, uncontrolled thyroid disease or diabetes, and certain infections. In India, where vitamin D and B12 deficiency are widespread, hypothyroidism is common, and PCOS affects many women, these factors are worth checking before a future pregnancy, but they are not the cause for most single losses. Genital tuberculosis, more relevant in India than in many countries, can affect the uterine lining and is investigated only when there is reason to suspect it.

What does NOT cause a blighted ovum: lifting, housework, normal exercise, sex in early pregnancy, ordinary work stress, or eating everyday Indian foods. If you have been quietly blaming yourself, this is the part to read twice.

Many blighted ovums have no symptoms at all and are found only at a routine dating scan. When signs do appear, they tend to be subtle:

Diagnosis is made on a transvaginal ultrasound, which gives a much clearer early view than an abdominal scan. Most gynaecology clinics, FOGSI-member hospitals and diagnostic centres offer it, typically for Rs 800 to Rs 2,500.

Doctors follow international criteria (ACOG and RCOG, used by FOGSI institutions). A blighted ovum is confirmed when there is a gestational sac of 25 mm or more in mean diameter with no embryo, a sac of 18 mm or more with no yolk sac, or no expected growth on scans 7 to 14 days apart. The 25 mm threshold is deliberately conservative so that a pregnancy that is simply earlier than expected is never mistaken for a loss.

This is why a repeat scan matters. An empty sac at 6 weeks can be perfectly normal; a follow-up scan 7 to 14 days later showing no progression is what confirms the diagnosis. Blood hCG levels can support the picture: in a healthy early pregnancy hCG roughly doubles every 48 to 72 hours, while in a blighted ovum it plateaus, rises slowly, or falls. Together, scan and hCG also help rule out an ectopic pregnancy or a molar pregnancy, both of which need different and sometimes urgent care.

You are entitled to clear, compassionate communication, copies of your reports, and a second opinion, especially if the diagnosis rests on a single inconclusive scan. Ethical practitioners welcome this. Avoiding a wrong diagnosis matters: no one wants to end a pregnancy that was simply early.

Whichever route you choose, follow-up confirms the uterus is empty, with a scan and hCG that falls to undetectable, usually over 4 to 6 weeks. Light bleeding and mild cramps for 1 to 2 weeks are normal, and periods typically return within 4 to 8 weeks.

If you are Rh-negative and your partner is Rh-positive or unknown, you should receive anti-D injection within 72 hours of the loss (Rhoclone or RhoGAM, about Rs 1,500 to Rs 5,000) to protect future pregnancies. Ask about this specifically, as smaller clinics may need to order it.

Sex can resume once bleeding has stopped and you feel ready, and there is no medical reason for months of abstinence. Watch for heavy blood loss, fever, or foul-smelling discharge, which can signal a uterine infection or anaemia and need prompt review.

Grief after a blighted ovum is real and legitimate, even though the pregnancy was early and there was no embryo. You felt the hormones, the symptoms, the planning and the hope. In some Indian families early loss is brushed aside as 'not a real pregnancy yet' or met with pressure to try again quickly. That dismissal is unhelpful, and you are allowed to set boundaries about how the loss is discussed.

Shock, sadness, guilt, anger at your own body, and anxiety about trying again are all normal. Partners grieve too, often more quietly, and talking openly about it protects your relationship. Our guide to coping with pregnancy-loss grief goes deeper into this.

Reach out for professional support if low mood or anxiety lasts more than 2 to 4 weeks, if you feel hopeless, or if daily life feels impossible. Indian helplines include iCall (9152987821) and the Vandrevala Foundation (1860-266-2345), and counselling is increasingly available at hospital networks and online. Under the Maternity Benefit (Amendment) Act, women in India are entitled to six weeks of paid leave after a pregnancy loss, though awareness of it is low.

Here is the reassuring part. After a single blighted ovum, your next pregnancy is about as likely to succeed as for a woman with no history of loss, roughly an 80 to 85 percent live-birth rate for healthy young couples. The random chromosomal errors that cause most cases do not tend to repeat.

Medically, you can try again after your first normal period, usually 4 to 8 weeks later. The old advice to wait 3 to 6 months is no longer evidence-based, and ASRM and ACOG support trying once you feel emotionally ready. Some women want to try straight away; others need months. Neither is wrong.

Good preparation helps the odds for everything other than the random risk: folic acid for 2 to 3 months before conceiving, correcting vitamin D, B12 and thyroid issues, a healthy weight, and stopping smoking. When you are ready, our guide to trying to conceive covers the practicalities.

Two or more losses (recurrent miscarriage) are a different situation. Then it is worth a workup, parental karyotype, a look at the uterine cavity, thrombophilia screening, thyroid and glucose, with genetic counselling where indicated, because many causes are treatable. Read more in our guide to recurrent miscarriage.

The pregnancy after a loss can feel like holding your breath. Anxiety is almost universal and entirely understandable.

Many doctors offer closer early monitoring after a previous loss: hCG checks at 4 to 5 weeks and again 48 to 72 hours later to confirm appropriate doubling, and an early scan at 6 to 7 weeks to confirm the pregnancy is in the uterus and has a heartbeat. Once a heartbeat is seen, the chance of miscarriage falls sharply, to under 5 to 10 percent in most studies. This monitoring does not change the outcome, but for many women it brings real reassurance.

Progesterone supplements are sometimes used after a previous loss; the evidence is limited but the approach is generally safe, so discuss it with your obstetrician. Above all, lean on your partner, your gynaecologist and mental-health support as you pass the week of your earlier loss, often the moment confidence starts to return.

Most recoveries are uncomplicated, but get emergency help (call 108) or go to a hospital straight away if you notice any of the following:

• ACOG Practice Bulletin: Early Pregnancy Loss
• NHS: Miscarriage
• RCOG / NICE: Ectopic pregnancy and miscarriage diagnosis and management (NG126)
• WHO Model List of Essential Medicines (misoprostol, mifepristone)
• ASRM: Evaluation and treatment of recurrent pregnancy loss
• FOGSI (Federation of Obstetric and Gynaecological Societies of India)