Clomid cycle day 4-8??


Hi, second round of clomid. Last round I did 50mg days 3-7. My dr just prescribed me 100mg days 3-7, but the pharmacy didn’t have my prescription and today is cycle day 3 for me. I’ll be able to pick it up tomorrow. I hear a lot of people taking it cycle day 5-9, so I might just do that. Wondering if anyone has every tried cycle day 4-8 and why I never hear of that? Thanks!