I know it's hard not to link these events together, especially when you've previously lost a pg due to food poisoning, but I find it hard to believe the soup was the cause.

I went a bit... okay, COMPLETELY overboard paranoid about food safety when I was pg with DD. It was either that or spend an hour crying after every meal in case I'd eaten the wrong thing. Normal food safety rules apply (basic hygiene and cleanliness) and then you have the additional recommendations related to "high risk" foods for listeria and mercury (fish).

I'm very sorry to hear of your loss. I hope this is the last time you have to endure this pain.