symptom-guides

Signs of Ovulation: How to Know When You're Ovulating

The most reliable signs of ovulation — LH surge, egg-white cervical mucus, BBT rise, mittelschmerz — and how to use them together for accurate ovulation

Ovulation is not a feeling or a date on a calendar — it's a physiological event driven by a hormonal cascade, and it leaves detectable signatures before, during, and after it happens. Tracking these signatures accurately is the basis of both fertility awareness and understanding your cycle. The Four Primary Signs 1. LH Surge (Ovulation Test Strips) What it is: The luteinizing hormone surge triggers final egg maturation and follicle rupture. LH rises dramatically over 12–24 hours, peaks, then falls. What it tells you: An LH surge is about to complete. Ovulation typically follows 24–36 hours after the surge begins — so a positive test today means ovulation tomorrow or the day after. How to detect it: Urine LH test strips (ovulation predictor kits). A positive test shows two lines of equal darkness, or a "peak" on a digital OPK. Test twice daily during the expected surge window — once in the morning (not first morning urine; mid morning is better) and once in the afternoon. The surge can be brief and missed with once daily testing. Sensitivity matters: Standard strips detect LH at 20–40 mIU/mL. Lower sensitivity strips (10 mIU/mL) catch surges earlier and are useful for PCOS monitorin