My periods are never constant. Last month I started on day 27. The month prior to that, I started on day 35. The month before, day 40. Prior, day 32, and 28. Now, I'm on day 39 and I still have not started. Although this morning, I thought I had, because when I went to the bathroom, there was a tiny bit of pink on the tissue. So (sorry to be so graphic), I used a tampon, and 6 hours later, checked it, and there was stuff on there, but probably not even enough to use a tampon. Would this be considered "Spotting?" And my first days are usually extremely heavy. Is it possible that the little bit I had was "implantation spotting" and that I could be pregnant?