I ate freshly cooked prawns, last year, but I wouldn't touch those bought cooked already. Same thing for the ham, etc - keep an eye on how long it's been out of the fridge and microwave it. As for salads... Personally I wouldn't unless I could ask the contributor when they made them. Some people would happily make the salad the night before, and dress it on the day, and although normally I would consider this to be fine, I didn't eat things prepared more than a couple of hours before when I was pg. If you feel the same way, I would just make your announcement early in the day so that it becomes acceptable for you to ask contributors about the history of their particular salad.

So pleased to see you counting the weeks... so happy for you still!