It's not certain that you will experience any problems. Usually, when fish products spoil, there's a pretty distinct odor that would make it difficult for you to eat. That doesn't mean it was or was not starting to spoil. What I'd do is just wait - by now, if you were going to get sick, you would be sick already. Food poisoning doesn't take very long to start creating symptoms. If you experience excessive vomiting or diarrhea, it would certainly warrant a visit to the doctor to rule out bacterial infections and to ensure you don't get dehydrated.