Clomid 50mg

Hello all! My husband and I are having an IUI done to try and become pregnant. This will be my first iui and my first time on fertility meds. I got put on 50 mg of clomid from CD 3-7. I am on cd 12 today and had an US and I only had 2 follicles, the biggest was only 11mm. My doctor prescribe 5 more days of clomid and then I go back for an US on the 31st. Has anyone had this happen and have any success to share? Or even if you did this and didn’t have success. Thanks!