Can I do that / Can I eat that ?

Just out of curiosity, my first pregnancy I did everything according to the books. I was very fortunate that I am not a "big" drinker, so alcohol wasn't an issue and I was very anti spicy food & Sushi.

I dyed my hair and had no problems.

I carried on with karate up until 7 months.

Then little one arrived and all went back to normal... And I found a love for spicy food and Sushi...

But this time round, early days of first trimester. I can't stop craving sushi & nachos. My doc has had me stop exercising just for a little bit, until heart beat is there. And that all looks well and can get the go ahead again. But not to say that I need it now, as in this very second. But how do I go about eating Sushi etc? I was speaking to a friend of mine that stays in Asia, and shes seen plenty Asian woman eating sushi, it's there's culture... sooo confused. Is it a myth? Any Advice?