Evaluation and Management of Day 28 Bleeding After Ovulation Induction

Diagnostic Approach

Quantitative serum β‑hCG measurement should be obtained immediately as the first step in any patient presenting with bleeding on day 28 after ovulation induction to determine pregnancy status【1】【2】.
If β‑hCG is positive, transvaginal ultrasound is the preferred initial imaging modality for first‑trimester bleeding because it provides superior visualization of early gestational structures【1】【2】.

Assess the presence and location of the gestational sac (intrauterine vs ectopic) to differentiate viable pregnancy from ectopic implantation【1】.
Visualize the yolk sac as an early marker of intrauterine gestation【1】.
Identify subchorionic hematoma, which may explain bleeding in early pregnancy【2】.
Look for adnexal masses or free pelvic fluid that suggest ectopic pregnancy【1】【2】.

β‑hCG (IU/L)	Expected Ultrasound Findings	Recommended Action
< 1,500	Gestational sac often not yet visible; serial β‑hCG every 48 h should show ~66 % rise in a viable intrauterine pregnancy【3】.	Continue serial β‑hCG monitoring.
1,500 – 5,000	Gestational sac should be visible; absence raises concern for ectopic pregnancy or early failure【3】.	Perform transvaginal ultrasound; consider ectopic work‑up if sac absent.
> 5,000	Definitive intrauterine structures (gestational sac, yolk sac, fetal pole) should be apparent【3】.	Confirm intrauterine pregnancy; manage bleeding accordingly.

Refrain from digital pelvic examination until placental location is confirmed by ultrasound to exclude placenta previa【4】【5】【6】.
Monitor for warning signs that require urgent evaluation:
- Heavy bleeding (soaking a pad in < 1 hour)【4】
- Severe abdominal pain【4】
- Passage of tissue【6】

Hemodynamic assessment is mandatory. Unstable patients require immediate surgical intervention【7】.
In hemodynamically stable patients, medical (methotrexate) or expectant management can be considered【3】.

Patient is hemodynamically stable【3】.
β‑hCG ideally < 1,500 IU/L (acceptable up to 5,000 IU/L)【3】.
No fetal cardiac activity on ultrasound【3】.
Ectopic mass size < 35 mm【3】.
Minimal or no pain【3】.
Ability to attend close follow‑up【3】.
No contraindications to methotrexate【3】.
Critical safety note: Methotrexate must not be administered at the first visit unless ectopic pregnancy is unequivocally diagnosed and an intrauterine pregnancy has been definitively excluded【3】.

In patients with repeated failed cycles despite documented ovulation, evaluate for other causes of anovulation or infertility【7】.
Do not rely on a single β‑hCG value; serial measurements combined with ultrasound correlation are essential for accurate diagnosis【3】.

Strength of evidence: Not explicitly stated in the cited sources.