[pom19]

More likely Vitex and or SP are causing that. I doubt it if Maca does, since Maca is not a phytoestrogen herb. Any time you take a phytoestrogen herbs it will likely affect the period, so if you want to go back to your old cycle then I would stop both Vitex and SP. Good chance Maca is fine, so just try to see if you are fine after cutting Vitex and SP, if not then do not take Maca either. Read the posts on biofemales on this issue. Also see below for some info on Vitex:

http://www.webmd.com/vitamins-supplements/ingredientmono-968-vitex%20agnus-castus.aspx?activeingredientid=968&activeingredientname=vitex%20agnus-castus