The EPO might be causing the bleeding. It is good for regulating hormones, and it is not uncommon for you to have breakthrough bleeding or AF after taking it. That was my experience with it. Within weeks of starting EPO I spotted, then ovulated, but my luteal phase was only 8 days. I might be confused, but I think that it helps regulate estrogen levels (which are what are necessary for O), and once you O should stop taking them for that cycle. I don't remember clearly though, so hopefully someone will correct me if I'm wrong. My first charts after AF returned looked alot like yours, but I stopped taking the EPO after that first cycle (I am trying to be patient with my body because I don't want to rush into another pregnancy until my ds and my body is ready) so maybe it can help your cycles become a little more regular in a shorter amount of time.