Note the first day of your menstrual period as Day 1
Track the length of your menstrual cycle for several months
Identify your average cycle length
Subtract 14 days from your average cycle length to estimate ovulation day
Count backward 14 days from the first day of your next expected period
Mark the fertile window as the 5 days before ovulation plus ovulation day
Use ovulation predictor kits to detect the luteinizing hormone surge
Check cervical mucus for clear, slippery, egg-white consistency
Track basal body temperature daily to confirm ovulation after it occurs
Use a menstrual cycle calculator or fertility app for estimation
Consult a healthcare professional if your cycles are irregular