Post Tubal Ligation Irregular / Frequent And Prolonged Periods

I had my third baby 2/15/11 and my bilateral tubal ligation 2/16/11. No complications after the laparoscopic surgery. Breastfed and formula fed together from the beginning, pumping from about 4 weeks to 6 weeks until I went back to work and supply diminished. Bled after birth until 5 weeks, when I had my post natal appointment. Started first period after that around 3 weeks later (baby was 8 weeks). It was 'normal' for me - lasted about 6 days, had cramps before and the first 2 days. All normal for me. I know my normal cycle because I had not been on BC for about 8-9 months before becoming pregnant and was very regular until the month before I got pregnant. So anyway, had my second period beginning may 6 and lasting til may 11. Again, all very normal for me. My husband and I had regular intercourse probably about every other day during the time I was not bleeding, with only the tubal ligation as birth control. 17 days after I stopped my second period, on may 23, I began spotting. It was very light, and I thought it was sex-related. It varied from brownish to light red to slight pinkish. The next day the same. The third day I needed a tampon, but only a light one. After that for a few days I bled more heavily, but not as heavy as the start of a normal period -- about how I normally would towards the second 1/2 of my regular periods. On most days during this I would go several hours with no bleeding and think it was all over. I went all last night with only a pantyliner which was ahem,not needed by the time I woke up this morning. However, I got to work and around 9am it started, very very light again. This is day 11.
 
Any ideas? Please no hijacking here, I am looking for some help.

I've called my GYN and left a msg for the MA or nurse to call me about it but that was yesterday morning and I've not yet heard back. . .
  
To mention, this long 11 days has had NO cramping whatsoever.