When to take EPO

Kershal • MC 9th oct 2014, BFP 10th Oct 2015
Would it be ok to start taking Evening Primrose Oil At 12DPO i know they say to stop once u O as it causes contractions and can interfear with Implantation But im 99.9% positive AF is going to show, i have never taken it before and after failed attempts of Robitussin and grapefruit juice im going to try this as only have 2 cyckes of clomid left to try... so just wanting peoples opinions on when they'v taken it, call me an idiot but i just wanted to ask first..