Breakthrough bleeding mid cycle

Jo

Has anyone experienced really odd bleeding between cycles? I've come off BC (after 10 years) beginning of January and had one normal period (after the withdrawal bleed). I'm using OPK and I'm 100% sure I ovulated in Feb 5 and had AF 11 days later. Was really pleased I ovulated and had AF and just felt I was getting back to normal.

Until of course, I had brown discharge yesterday, clots and pink discharge today. This is CD16 - I'm in my fertile week. What the hell is going on?? Doctor was no help at all... I shouldn't be having any break through bleeding yet! I haven't even ov!