Quick update. My Dr thinks it was most likely a viral infection rather than food poisoning and she said given what I had eaten if it was food poisoning, it certainly wasn't salmonella and highly unlikely to be listeria. She said the most important thing for the baby is not to be dehydrated, and given I wasn't sick for a long period of time & got fluid into me straight way, thinks that everything should be fine. She also checked the baby's heartbeat, so I'm feeling much better that bubs wasn't effected. Very stressful experience!