Tracking options
Ovulation predictor guide
Different tools answer different questions. A calendar estimates a likely window; tests and observations add information about your cycle.
Calendar estimates
A calendar uses past cycle length and an assumed luteal phase. It is least reliable when cycles vary and should not be used as contraception.
LH urine tests
Ovulation predictor kits detect luteinizing hormone in urine. Follow product instructions and remember that a surge does not guarantee ovulation in every cycle.
Temperature and cervical mucus
Basal body temperature can show a sustained change after ovulation. Cervical mucus may become wetter and more slippery beforehand. Consistent observations can add context.
When to ask for help
Speak with a clinician about very irregular cycles, severe pain, unusual bleeding, or difficulty conceiving.