The Window, Explained
Sperm can wait; the egg can't. Intercourse in the days before ovulation lets sperm preposition in the reproductive tract, which is why the two days before ovulation carry the best odds, roughly 25–30% per cycle for healthy couples in their twenties.
After ovulation, the egg degenerates within a day and the window closes until the next cycle. Intercourse more than five days before ovulation rarely leads to conception.
Finding Your Ovulation Day
The calendar method, ovulation about 14 days before the next period, is a decent average for regular cycles. But stress, illness, and travel routinely shift ovulation by days.
LH test strips turn positive 24–36 hours before ovulation, giving real-time prediction; basal body temperature confirms ovulation after the fact with its 0.3–0.6°C rise; cervical mucus that resembles egg white is the classic fertile sign.
When to Seek Help
Most healthy couples conceive within six to twelve cycles. Standard guidance: evaluate after 12 months of trying under age 35, or 6 months at 35+, sooner with irregular cycles or known conditions.
Age is the strongest variable: fertility declines gradually from the early thirties, with the steepest slope after 40.
Sources
FAQ
When am I most fertile?
The two days before ovulation and ovulation day itself, roughly days 12–14 of a 28-day cycle.
How do I confirm ovulation?
LH strips predict it 24–36 hours ahead; a sustained BBT rise confirms it afterward; fertile mucus marks the window.
How long should we try before seeing a specialist?
12 months under 35, 6 months at 35+, sooner with irregular cycles or known fertility factors.
Please read this first: these results are educational estimates, not medical advice. For decisions about your health, talk to a qualified professional.