I by mistake had 2 pieces of sushi with raw salmon not knowing i shouldn't should i be nervous? how would i know if it had any adverse effects?

Your body will say: Is there any particular reason you shouldn't eat raw salmon, e.g., an allergy? Your body would let you know if you ate something bad for you. Otherwise, if it was prepared well there should be no adverse effects and there's no need to be nervous. Many people enjoy sushi regularly.

Shouldn't be problem: Raw salmon in sushi, should not be problematic, so no need for nervousness. I prefer the cooked variety. There are usually no adverse effects of raw salmon sushi.

Allergic reaction: If you are allergic to it you should see hives, red patches on your body, in worse cases difficulty breathing.

Sushi is fine.: The main concern with sushi is obviously the chance of bacterial infection in the context of eating raw fish. Those who make sushi for us to eat undergo rigorous and lengthy training in order to prepare the raw fish in a way that minimizes the chance of infection while allowing us to eat such an awesome delicacy, If it were bad, nausea, vomiting and diarrhea would ensue.