First IUI

Sheets • Ttc #1 3 years of marriage . Getting desperate ! But keeping the faith
Hi ladies . In starting my first IUI with clomid  this cycle in June . I just got my stupid period so I've been told to begin clomid on day 5- day9 and then come in for ultrasound on day 12 . I'm excited  but very apprehensive as i have heard more failure than success stories about IUI . Any first hand experiences? What should I expect ? Any words of advice ? Help a nervous wreck out please