What Does Implantation Bleeding Look Like vs a Period?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
Bleeding described as implantation bleeding is often light spotting, but its color, amount, and duration can overlap with a light period or bleeding from other causes. When attributed to implantation, this bleeding is described as occurring about 6-12 days after conception, around the time the fertilized egg attaches to the uterine wall. Implantation bleeding usually lasts 1-3 days versus the 3-7 days of a typical period. The flow is much lighter - often just spotting or light pink discharge rather than the heavier red flow of menstruation. Light bleeding or spotting can occur in early pregnancy and may be mistaken for a light period, but estimates of bleeding specifically caused by implantation are uncertain. Some people report mild cramping and light spotting around the time a period is due, but symptoms cannot confirm the cause. If pregnancy is possible, take a pregnancy test at the appropriate time. Seek prompt medical care for heavy bleeding, severe or one-sided pain, shoulder pain, dizziness, or fainting.
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