Evening Primrose Oil Cures

This stuff is a gift. I have had horribly painful cramps every month since the very first period I ever had and Evening Primrose Oil (EPO) makes them bearable enough that I might have to take a single Advil, if that. I used to have no alternative to popping a bunch of IB Profen for three days straight.

I have one question for those in the know: does it delay your period? I've heard it said that it can delay ovulation. Does this mean I'm taking too much? I don't want to get pregnant or anything, I just want to know if this is potentially bad.