IUI right time after HCG trigger shot? Plz help

I took HCG trigger shot on 12th day at 8 pm. Follicle size were 20.3, 17.3 mm in left ovary and 19.2 mm in right ovary. After 24 houurs I done follicular monitoring eggs were increased in size but not ruptured after few hours later I m feeling pain in my lower abdomen and back

Tomorrow should i go for IUI or not? I think it is a bit late. I think ovulation is already happened .

Is it possible ovulation to happen before 36 hours after hcg trigger shot?

Plz help