First-Trimester Bleeding and Cramping: When to Worry

Light spotting and mild cramping are common in early pregnancy, but any bleeding warrants clinician contact.

Common Benign Causes

• Implantation bleeding – light, brief, ~6–12 DPO.
• Cervical changes – friability from hormonal vascularity; post-coital spotting.
• Subchorionic hematoma – often resolves; monitored by ultrasound.
• Uterine stretching – cramping from ligament growth.

Red Flags (Seek Immediate Care)

• Heavy bleeding (soaking pad/hour)
• Severe abdominal/pelvic pain
• Dizziness, syncope, shoulder tip pain
• Passing tissue/clots > golf ball
• Fever >38°C

Evaluation

• Quantitative hCG (trend over 48 hrs)
• Transvaginal ultrasound (viability, location)
• Rh typing – give Rho(D) immune globulin if Rh-negative.

Most early bleeding does not end in miscarriage, but prompt assessment ensures safety.