ok, mine was totally erratic, over really fast, like in a day and a half, but then, a little over a day later, it started again, then stopped after 12-ish hours, then, 2 days later, again, for a few hours. ???!!! it has been a little weird since I went on bc last year, but I went off it like 3 months ago, (the hormones were really getting to me, always upset, gaining weight....) and it was starting to get back to normal. arg. only have had one since starting atkins, so we'll see what happens. send good "normalizing" thought waves please!!!