What should you know about single embryo transfer twins?

Single embryo transfer is intended to place one embryo in the womb. Rarely, the embryo separates after transfer and develops as two genetically very similar embryos. This is different from transferring two embryos, which can lead to non-identical twins if both implant.

An early scan can show whether one or more pregnancy sacs are developing and whether the pregnancy is progressing in the womb. Twin pregnancy needs closer antenatal planning because it can place extra demands on the pregnant person and may need more frequent checks.

Take fertility medicines exactly as prescribed and tell your clinic about bleeding, pain, or a missed dose. A pregnancy test and ultrasound are arranged at the time advised by your fertility team. If twins are confirmed, ask about the scan schedule, nutrition, activity, and the maternity team who will coordinate your care.

Micronised progesterone may be prescribed after treatment to support the womb lining. Do not start, stop, or change it without speaking with the prescriber.

Seek urgent medical help for severe or one-sided abdominal pain, heavy bleeding, fainting, marked dizziness, shoulder-tip pain, chest pain, or trouble breathing. Contact your fertility clinic promptly for persistent pain, bleeding, fever, or concerns about medication.

Ask how and when pregnancy location will be checked, what findings would suggest twins, which medicines should continue, who will provide antenatal care, and which symptoms need emergency assessment.