Yes, it’s still OK. There is a window where the egg could be fertilized, from around 3-5 days before ovulation until the day of ovulation (and maybe one day after ovulation). The day of ovulation might be the best day to do an Intrauterine Insemination (IUI) – if you choose one IUI per month we time it for the day of expected ovulation for two IUIs a month we choose the day before ovulation and the day of ovulation. If we are monitoring a treatment cycle with ultrasound and you have a decent-sized follicle and then get a positive LH surge I would do an IUI on the day of your surge. The egg has up to 24 hours after ovulation when fertilization could occur.