Bleeding One Week Before Period: Implantation Bleeding vs. Other Causes
Light bleeding/spotting ~1 week before expected menses could be implantation bleeding but has other causes.
Implantation Bleeding Characteristics
- Timing: 6–12 days post-ovulation (typically day 20–26 of 28-day cycle).
- Appearance: Scant, pink/brown (not bright red); no clots.
- Duration: Hours to 1–2 days.
- Associated Symptoms: Mild cramping, breast tenderness, fatigue, nausea (early pregnancy signs).
Differential Diagnosis
| Cause | Distinguishing Features |
|---|---|
| Ovulation Spotting | Mid-cycle (day 14); clear/stretchy mucus; brief. |
| Hormonal Fluctuation | Irregular cycles, PCOS, thyroid, perimenopause. |
| Contraceptive | Breakthrough bleeding (OCPs, IUD, implant). |
| Cervical | Post-coital; ectropion, polyp, cervicitis. |
| Early Miscarriage | Heavier, crampy; may follow positive test. |
| Infection/STI | Discharge, dysuria, pelvic pain. |
