Heavy 4-5 Day Bleeding on Expected Period Day: Likely Menstruation, Not Implantation

Implantation bleeding is typically:

  • Light (spotting), pink/brown.
  • Brief (hours to 1–2 days).
  • Timing: 6–12 DPO (before expected period).

Heavy, red, 4–5 day bleeding on schedule = menstruation.

Why Confusion Arises

  • Early pregnancy bleeding (subchorionic hematoma, cervical) can mimic period.
  • Hormonal fluctuation can alter flow.

Definitive Answer

Quantitative serum β-hCG. If negative → not pregnant. If positive + bleeding → evaluate for viability/ectopic.

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