Cycle confusion - help please!!

Ru
So. I'm 27, healthy. Was on the pill for two years, went off it in January when DH and I decided to start TTC. Had two normal cycles - 30 day cycle in feb, with ovulation round day 14, 28 day cycle in March with ovulation round day 14. DH is in a wheelchair so we can only conceive via <a href="https://glowing.com/glow-fertility-program">IUI</a> or IUF. First <a href="https://glowing.com/glow-fertility-program">IUI</a> meant to happen this month. I am now on CD 14, no positive OPK, growing follicle visible on internal vaginal scan. But doc wants to scan AGAIN on Monday. What's happening?? What happened to my perfectly regular cycle?? I am so stressed and terrified :( HELP!!!