I'm not sure if they physical helped but I did feel a bit better. Placebo or not, I'll take that! Wear long tops though if you are still at the stage of not telling - I got rumbled by experienced mamas when wearing mine.
I found they helped me particularly as I have quite a long train commute which was making me feel a million percent worse. As others have said, it my well have been placebo but I was feeling better so I was taking that!
Oh i know cryingshame the midwife said it to me yesterday too..... and I DONT LIKE GINGER not before preg and not now!!!! I asked her what to drink as atm i can only stomach water and oj and she smiled and said 'poor you'.... Helpful