I had it too, rather badly, very unpleasant but not like I was going to poop, I always knew it would be wind but it would sneak up on me quickly so wouldn't have any control over it at all. When I was carrying Imogen, I was about 36wks and it was xmas at the in-laws. In the end I just had to say "look I can't help it but I don't regret eating those pickled onions. You'll just have to accept my apology now for all past and future episodes otherwise you won't see me cos I'd be in the smallest room all night" Fortunately they saw the funny side!