Herbal Treatments for late O?

Have you been taking Evening Primrose Oil? My O was very late for the past 5 or 6 cycles and my cycle average has been about 33 or 34 days. The past 2 cycles Ive been taking EPO from as soon as I get AF and stopping once I O (as it mimics oestrogen) and this cycle was my shortest cycle in months and I Od on CD15. I was taking about 2000mg a day. Hope thats of some use to you :)