Is it safe to use a vibrator when your pregnant?

So long as everything is healthy and normal with no bleeding you can pretty much swing from the roof top, naked as a jay bird, biggest baddest vibrator in hand... BUT to much action before three months is usually cautioned against, so is electrical vibrating things. I was told not to use an electric blanket nor a vibrating foot mager. So while I've found nothing to so why or if it all such a thing actually IS harmful... I wouldn't do it. For some women just an before 20 weeks can be risky.