Updated by the Progyny Clinical Team — September 2025.
Bleeding during early pregnancy is common and understandably concerning. It happens in almost 20% of pregnancies and does not always indicate a miscarriage. In some cases, bleeding may be linked to a subchorionic hematoma (SCH).
A SCH is a collection of blood between the chorionic membrane (the outer membrane of the developing pregnancy) and the uterine lining, where the embryo implants.
Why does a subchorionic hematoma cause bleeding?
As the placenta grows, it develops a rich network of blood vessels to support the pregnancy. A small disruption in this network can lead to bleeding. This may appear on an ultrasound or be noticed as vaginal bleeding.
Can a subchorionic hematoma cause pregnancy loss?
Most hematomas resolve on their own without intervention. In some cases, however, they may expand and increase the risk of pregnancy loss.
Are subchorionic hematomas more common with fertility treatment?
Subchorionic hematomas are fairly common in early pregnancy. Research shows the overall rate is similar whether you conceive with fertility treatment or without medical assistance. If you go through fertility treatment, though, you typically have earlier and more frequent ultrasounds, which makes hematomas easier to detect.
Some factors related to infertility treatment may play a role. For example, if your healthcare provider starts you on low-dose aspirin as part of your care plan, studies suggest you may have a slightly higher chance of developing a hematoma.
Most subchorionic hematomas are small, resolve on their own, and don’t affect the outcome of your pregnancy. You may notice light bleeding or spotting, but serious complications are rare.
What to do if bleeding occurs
If you have spotting or light bleeding, contact your provider. They may recommend:
- An ultrasound and bloodwork, such as hormone level checks
- Pelvic rest (avoiding intercourse or tampons in early pregnancy)
Light bleeding does not always indicate a serious problem, but it’s important to let your provider know so they can decide if follow-up care is needed.
Key takeaway
Subchorionic hematomas are relatively common in early pregnancy and often resolve on their own. While they may sometimes raise the risk of pregnancy loss, many do not cause complications. If you notice bleeding, reach out to your provider for evaluation and guidance.
If you have questions or concerns, Progyny is here for you. Please contact your Progyny Care Advocate for support.
Disclaimer: The information provided by Progyny is for educational purposes only and is not medical advice. Always consult a qualified healthcare provider for medical guidance.