I'm in the same boat, and wonder if there's an explanation for this. I had my first pp period in dec, 35 days later had another, 21 days later had some brown spotting, and now it's been a total of 39 days (incl. the 21) since my last period. I'm so confused!! I tested this am to make sure and it was neg, so that's good. If I still have no period this week, I'm going to test again. This is just too weird! That would be awesome to have it gone for a while, but I can't take the suspense!!! I know after getting off the pill and before having kids, I had a 42 day cycle once. Anyway, I really need to start charting so I can understand this better. I've been scoping out TCOYF, but can't find any great answers (other than that spotting b/n periods is normal).