If you are still worried, go to a gynae to do an ultrasound of your baby. It would be better for your mental health and have a peace of mind.
I had food poisoning in Krabi and had 5 - 6 oysters together with bbq seafood. food poisoning for 3 days and all's fine.
I had food poisoning at 12 weeks pregnant and kept vomiting. But baby is now 1 year old and totally okay :)