Calculate your earliest post-contraception or post-loss ovulation window, understand hormonal clearance intervals, and navigate your cycle reset safely.
First ovulation after stopping oral contraceptives or following an early pregnancy loss can occur as early as 14 to 21 days post-stop/bleeding, before your first true period arrives. For long-acting progestin injections (Depo-Provera), full clearance typically requires 3 to 9 months.
検証機関: Free Ovulation Tracker 臨床研究および計算方法論チーム
主要引用文献基準: Wilcox et al. (NEJM, 1995 & 1999) • ACOG 実践ガイドライン • WHO 生殖医療基準
プライバシー設計: 100%クライアント側ブラウザ実行（サーバー保存ゼロ）
Withdrawal bleed occurs 2–4 days after stopping. True ovulatory cycle typically resumes within 3–6 weeks once the hypothalamic-pituitary-ovarian (HPO) axis clears synthetic ethinylestradiol.
When you observe your first natural period or confirmed ovulation shift, transition to our primary free ovulation tracker and calendar to project your upcoming 6 cycles.
Exogenous synthetic estrogens and progestins maintain high feedback that silences hypothalamic pulsatile GnRH and prevents the pituitary LH surge. Once cleared, the HPO axis awakens, allowing antral follicles to mature.
Following a miscarriage or chemical pregnancy, residual beta-hCG can cross-react with LH receptor assays, causing false-positive OPKs until systemic hCG drops below 5 mIU/mL.
Audited under our Clinical Methodology & Citations.
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