Reeeally need some input!!!

So this is my calendar. I got off of my period on January 1st. On the second, I took an opk because I have irregular cycles so I always start right after my period. It was extremely close to being positive, like the lines were almost equally dark. And the next night when I tested it was extremely light.. I have been struggling to get my periods back & would go months without them after coming off the pill. Then, yesterday I started dark brown spotting only when I wipe. Now, it’s gradually turned into this (pic below). It’s only been 13 days since I came off my period so what’s going on? Is it possible I ovulated the day after my period and this is implantation???