Oh stupid me of course Epi No can be used before birth (duh).

Most other devices though have cautions on them which tell you not to use them during pg. I've seen the Vielle one (which you can get at Priceline) and what can only be described as "weights" for one's vagina (sounds like one of Emily Howard's "lady's things" doesn't it?) in a pharmacy.

Pardon me, I'm off to powder my nose ...