Once u start ovulating is to late for iui?

No, it's still OK. See my other answer as well. 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. Best wishes.
Probably. I have always thought that once you ovulate the best time for insemination has past.