A positive test, then bleeding. Was it a chemical pregnancy?

A chemical pregnancy is a very early miscarriage: an embryo starts to implant and makes enough hCG for a positive test, then stops growing before a scan can see it.

It is also called a biochemical pregnancy, because a blood or urine test is the only sign it happened. It usually ends by about 5 weeks, counted from the first day of your last period, often around the time your period was due. It is common, and many pass as a slightly late period in women who did not test. It was a real pregnancy, and it is a real loss.

Chemical pregnancy bleeding is usually like a period and lasts about as long as your normal period.

It often starts on time or a few days to a week late, sometimes as spotting that turns into a normal flow. It can be heavier than usual, with more cramping and a few small clots. You cannot tell a chemical pregnancy from a late period by the look of the blood; the test result is what tells them apart. After an early miscarriage, bleeding or spotting can go on for up to 2 weeks (NHS). If it lasts longer, gets heavier instead of lighter, or comes with fever, tell us. Simple painkillers such as paracetamol help with the cramps.

hCG, the pregnancy hormone, falls back to a non-pregnant level over the next few weeks, and a home test turns negative.

If you had blood tests, the fall is what confirms it. NICE treats a fall of more than half over 48 hours as a sign that a pregnancy is not continuing. NICE also advises a home urine test 3 weeks after an early miscarriage; if it is still positive then, call us, because hCG that stays up needs a check. After IVF or IUI, we tell you when to repeat the blood test. [CONFIRM: Jananam follow-up routine] Until hCG is back to normal, an ectopic pregnancy is not fully ruled out, which is why pain on one side needs care the same day.

Most chemical pregnancies happen because the embryo had a chromosome error that stopped it growing, which nobody caused and nobody could have prevented.

These errors happen by chance as the egg or sperm forms. They become more common as the woman gets older, especially from 35. Less often, the womb cavity, thyroid, blood sugar or a clotting condition (antiphospholipid syndrome) plays a part; these are looked for when losses repeat, not after one. Work, travel, stairs, food and sex do not cause a chemical pregnancy. Folic acid, a healthy weight, no smoking, and treating thyroid or diabetes help any pregnancy start well, but they cannot stop a chance chromosome error.

You can try again once the bleeding has stopped and you both feel ready; many doctors suggest waiting for one normal period first, so the next pregnancy is easier to date.

There is no medical need to wait longer after a single chemical pregnancy. You can ovulate before your next period, so you can conceive in the very next cycle. Keep taking folic acid, 400 micrograms a day, until 12 weeks of the next pregnancy (NHS). After IVF, frozen embryos can often be transferred after the next period. [CONFIRM: usual gap] After two losses, we suggest a review before trying again.

Let yourself grieve it as a loss, because it was one, even if nobody else knew you were pregnant.

Going from a positive test to bleeding in a few days can feel cruel, and it usually happens in private. People may say 'at least you know you can get pregnant'. They mean well, and it can still hurt. Partners often grieve differently and more quietly, so tell each other what you need. It is fine to skip a baby shower or mute social media for a while. If sadness or worry is not easing after a few weeks, talk to us or our counsellor [CONFIRM: counsellor availability], or call Tele-MANAS on 14416, free and open 24 hours.