Ovidrel yet late ovulation?

I had a Day 11 (4/12/11) ultrasound and bloodwork monitoring and that evening upon the nurse's confirmation of my hormone level I injected myself with ovidrel that evening. I had the IUI procedure on (4/14/11). However, from 4/09/11 until 4/15/11 I had negative on the ovulation test kit. Then on the early morning of 4/16/11 I had crams where my right ovary is at, and I had then a positive on the ovulation test kit. I clearly remembered that the day of IUI I felt no crams from my ovaries. This is the fourth IUI I am going through, previously IUI I always had ovarian crams and positive ovulation result coincided with the IUI.

Did I have a defective ovidrel? Did I actually ovulate for my IUI? How is it possible to ovulate or have the sign of ovulation so many hours after ovidrel and IUI?

[Heather5]

You could always ask for an ultrasound next time to make sure the follicles have collapsed (released the eggs). But in general, they say not to use OPKs or ovulation tests when using trigger shots, since it is the HCG that triggers ovulation, not LH. Good luck!