Clomid cd 3-7 or 5-9?

Meagan

I am about to start Second round of clomid 100mg...First round was 50mg cd 5-9. My question is what is the difference from taking it 3-7 vs 5-9? And if taking it 3-7 worked for anyone? I asked my nurse and she said it was just doctors preference...so is there really no difference??