My last shot of depo was back in July havent had it since. I had what I think was a positive opk January 21st. January 25th, I started to spot and cramp. And I have spotted pink/red and cramped everyday since then to today. It will start off red in the mornings and turn to pink throughout the day. It is only when I wipe. No blood in the toilet or on my underwear or pad. I was wondering if anyone had opinions on it, if could be implantation bleeding, breakthrough bleeding or a very light period?