Light Spotting in Early Pregnancy: Causes and When to Call Your Doctor

Spotting (light vaginal bleeding) occurs in 15–25% of pregnancies, often around the time of expected menses (implantation bleeding) or in the first trimester. It is frequently benign but always warrants clinician notification.

Common Benign Causes

• Implantation Bleeding: 6–12 days post-ovulation. Light pink/brown, scant, 1–2 days. Coincides with expected period.
• Cervical Changes: Increased vascularity (ectropion) makes cervix friable. Spotting after sex, pelvic exam, or transvaginal ultrasound.
• Subchorionic Hematoma: Blood collection between chorion and uterine wall. Often resolves; monitored by ultrasound.
• Hormonal Fluctuation: Luteal-placental shift (~7–10 weeks).

Concerning Causes (Require Prompt Evaluation)

• Miscarriage: Bleeding + cramping, tissue passage. Risk highest <12 weeks.
• Ectopic Pregnancy: Implantation outside uterus (usually fallopian tube). Medical emergency. Symptoms: unilateral pelvic pain, shoulder tip pain, dizziness, hypotension. hCG rises abnormally.
• Molar Pregnancy: Abnormal trophoblastic proliferation. Vaginal bleeding, high hCG, ultrasound "snowstorm."
• Infection: Cervicitis (STI), vaginitis.

What to Do

1. Call Your OB/Midwife: Report amount (spotting vs. soaking pad), color (pink/red/brown), duration, associated symptoms (pain, cramping, fever, dizziness).
2. Wear a Pad: Monitor volume. No tampons.
3. Avoid Intercourse: Until cleared by provider.
4. Rest: Limit strenuous activity.

Red Flags – Go to ER: Heavy bleeding (soaking >1 pad/hr), severe pain, dizziness/fainting, shoulder pain, fever >100.4°F (38°C).

Most spotting resolves without intervention. Early ultrasound confirms viability, location, and rules out ectopic/molar pregnancy.