Evening Primrose Oil?

Krystal • TTC #2. Had ICSI to conceive #1 and trying naturally til Aug for #2.
I've read EPO can help boost CM ... I've read to take between 1000-3000 mg daily from AF to ovulation only. My question is for any that have taken EPO. I'm on CD 12 and had spotting today. More like a brownish goo and actually had to wear a liner today. I NEVER have spotting mid cycle. I don't ovulate until 20-21 as my cycles are 36 day cycles so I know it's not ovulation spotting. Has anyone else experienced this? I'm stopping EPO as I'm afraid it's playing with my cycle and all I wanted was extra CM!