Hi there
Just wanted to say don't worry!! Everyone - everyone - eats something they shouldn't when pregnant. The risk of getting ill from bagged salad is probably nil. I think someone once caught something years ago - consider all the bagged salad that is sold - and see the risk. Most pregnant woman I know eat it all the time and don't even wash it. A girl I knew preferred the bagged stuff as felt it would be safer than the non bagged stuff. All babies born just fine.
All the "what you shouldn't eat" lists are different. Midwives don't seem to know much either - they will all tell you different things. Just use common sense, and wash veggies and fruit well and cook meat well and avoid the usual soft cheese/uncooked meat.
When I was pregnant I ate bbq-d meat all the time until someone told me I shouldn't. There is always someone around to frown at you!
Good luck and enjoy your pregnancy - it's so so special.