The timing of IUI

I'm still freaking out a little bit here about the timing of our IUI.  With IUI, I think the timing is the most important thing.  I feel like this time things just didn't line up properly.  I don't know why my Lh surge took place so early.  The doctor didn't check my follicles to make sure they were growing according to schedule.  There was only one blood draw to check my Lh, so how do they know for sure it was a surge?  I did an OPK again yesterday afternoon and then today.  Yesterday there was a faint, faint line but today I didn't get any further positive results.   I've been charting my BBT this month, and my temperature has not gone up yet, which is always does when I ovulate.  And I haven't had any other symptoms of ovulation!  So the question in my mind is... did I actually ovulate?  Is it possible to have an Lh surge and then not ovulate... or ovulate a few days later?  Today I actually have a bit of a sore back and some cramping, so maybe that is ovulation happening?  I'm trying not to "stress" but this cycle just confused me and I have a ton of questions now.  I will try to relax...and hope for the best.  Maybe I ovulated just fine.  Maybe I am ovulating now and DH's guys will have stuck around long enough to wait for the egg.  Maybe I'll ovulate later and we'll cover the bases with our own BD tonight...  maybe, maybe, maybe...