If you have had 3 positive OPKs, then your body is gearing up to ovulate, and may have just done so. Post-ovulatory pain, and spotting is not uncommon. You are ovulating later than usual this month (as am I), so your period will be due about 1st October. I hope you are having lots of sex!!!
Nothing to be confused about...all sounds promising! Your LH surge is just taking a bit longer; variant of a normal cycle.
I just got my first positive OPK, but my husband away until Sunday. So annoyed!!! (Similar situation to Shelby...a month seems like a year!).