How do I know if I'm ovulating?

Signs include mid-cycle clear, stretchy cervical mucus, a slight rise in basal body temperature afterward, mild one-sided pain, and a positive LH ovulation predictor test. Regular predictable cycles are themselves good evidence of ovulation.

The fertile window is roughly the five days before ovulation plus the day itself, since sperm survive several days while the egg lasts about 24 hours.

Intercourse every 1-2 days across that window is more effective than trying to time a single day precisely.