Causes of Bleeding

Pregnant women can bleed for reasons other than implantation. If it’s heavy plus with or without pain or cramping at any time, call your doctor.

If you’re pregnant and you see blood, it may be caused by:

• Sex. Sometimes this happens early on, although it can happen at any time during pregnancy. Hormone changes in your body may be to blame. It should stop on its own.
• Ectopic pregnancy. This is when an embryo implants outside of the uterus. You may have bleeding with pain and cramps. It’s dangerous, and you need to see a doctor right away.
• Miscarriage. About 15% of known pregnancies end during the first few months. Most women bleed and cramp afterward. Call your doctor right away if you know you're pregnant and you have these symptoms.