Timing question with femera

I was just put on Femera for the first time with trigger shot and I am skeptical of the timing my doctor scheduled my IUI. I am supposed to ovulate on Tuesday( I always ovulate right on time, no issue with that). I had my mid cycle scan yesterday and he says at the rate they are growing I will have my IUI Thursday , do my trigger Wednesday but if I’m supposed to ovulate Tuesday, won’t that be too late ? I asked him and he told me the eggs will be the size they need Thursday. Anyone else experience this ?