I wish I could give you a better answer, but I'll give you the infuriating one I was given: sometimes the hormones just go a bit crazy and it just happens. Mine does that too (when not pregnant). I actually found Vitex and EPO helped to even things out (even if you aren't TTC, it just helps to even things out). Maybe do some research into those two supplements and see if that is something that you think might be right for you?