Did your cycle change after IUI?

Has anyone experienced changes to their cycle after doing a medicated IUl? My husband and I did a medicated IUl in December. I was on letrozole and then ovidrel for the trigger shot. The IUl was unsuccessful and we plan to do another sometime this spring. However, since doing the medicated IUl my cycles have been really off. Prior to the lUl, my cycles were like clockwork. Always 28-30 days, always ovulated on CD 14-15, very predictable and easy to track. But ever since doing the IUl, I can't seem to make heads or tails of my ovulation timing. My period still starts about 14 days after I ovulate, but trying to pinpoint ovulation has gotten difficult. I've had one cycle where I ovulated on CD 11, another on CD 18, and this cycle l'm on CD 18 and still no sign on an LH rise. I've never had this happen and now it's been 3 months in a row of irregular ovulation, and it all started after the medicated IUl. So l'm just wondering if anyone has experienced this before? I have an appointment with my RE next week and I plan to talk to her about it then