Ok. lets start from the start. 5 months ago I got the contraceptive rod (implant) in my arm, for the 3rd time. Before I had it in the first time my periods never started around the same time each month, and have always only lasted 4 or 5 days. So then I got the rod put in my arm and my period only came every 3 or 4 months, the second time I had it in my period came every month (such a disappointment from the enjoyment of not having to put up with it much the previous 3 years) so as I was saying I got this third one 5 months ago and so far have not had my period at all. I have also lost about 30-40kg rapidly in that 5 month period which can also mean no period. ok time to get down to it. A few weeks ago I had 3 days of spotting, which if my periods had been coming I worked out would have been the time of ovulation, and now I have had light bleed that i see when i wipe (but not enough for a pad or anything) if i had been having my period regular the last few months it would start next week. So, do I have implantation bleeding or is my period finally coming through??