Clomid advice

Wondering if anyone could give me some advice, getting ready to start my 3rd round of  clomid and feeling a little discouraged. My first round was 50mg taken days 5-9, and the second cycle 100mg Cd5-9. I'm going to take 100mg again this cycle, but was contemplating taking it on CD 3-7 or 4-8. Has anyone else done this and had luck? I hate to switch the days behind my doctors consent but I feel like it's harmless? Would love your thoughts!😊