Not responding to clomid 100mg

So I started clomid CD 3-7 and went to the RE for an ultrasound on CD 9. My Doctor said I didn't respond. Has anyone had this happen? I go again tomorrow (CD 11) to check again, but he said most likely he will put me on 150mg and start CD 11 like it's CD 3 and try again. I'd love to hear others stories about not responding to clomid 100mg. Hoping I can still get this IUI this month 🤞