I have been taking EPO since 28wks (but only 1 capsule orally daily and have just gone upto 2 capsules daily)...the reason why is because of this:

Like all herbs, the use of Evening Primrose Oil can take a month or two to build up, and produce the results you are looking for.
Once I hit 36 weeks I will then up my dosage again to 3 capsules orally daily....I won't be inserting.

So far I haven't had any ill effects or anything from taking EPO so I am not too worried...I just don't want to go overdue again!! (Went 11 days overdue last time)