Clomid CD3-7 vs. CD5-9?

Hey everyone, just wondering if anyone knows of the difference between taking clomid CD3-7 vs. CD5-9. I've been taking clomid on CD5-9. I started at 50mg, didn't O. Upped to 100mg and I did O but no pregnancy. Upped to 150mg which I just started last month and I did O. But I'm still not pregnant so I'm wondering if I should try it on CD3-7. Does anyone have any info or success stories on either CD? Thanks and baby dust to all!!! 💖💖💖