Early ovulation?

So right after AF left town, I got fertile CM.  This usually happens for a day so I didn't think much about it.  But it never went away and I wasn't taking anything to increase it...so I started using OPKs.  Well on cd9 I got an *almost* positive and had the most EWCM I've ever seen (sorry non TTC followers, it needed to be said) so we had plenty of sex in the next few days and I got a positive OPK on cd11.  I should mention that I also had terrible back pain and ovary pain starting on cd9, so I finally put a call into the RE to find out what was going on.

The u/s showed what I thought was a follie at 16mm on my right ovary, but the nurse said it was a cyst, but that was okay because it was probably the corpus luteum.  Also, my lining was 7.83!!!  That is the thickest it has ever been.  The nurse it looked post-ovulatory as well, but we'd see what the b/w showed.  Naturally I missed her call last night, but she left a message saying my LH was surging and I was ovulating yesterday.  Sure enough, I got another positive OPK last night (mind you, cd12's were all negative) and this morning's was still pretty dark, but all my EWCM has been gone for 2 days and my temp isn't any higher than the past few days, so all signs other than LH are pointing to me being 4dpo.   I thought about emailing or calling the nurse to clarify, but I figure I can be like everyone else in the world for one cycle and not have exact answers as to when I will or have Od.  Either way, I am thrilled I am Oing early and this cycle isn't a bust.