I need some help!!!

Okay, I have been craving shrimp lately and the wierd part about it is that I have never been a huge shrimp fan. So anyway, I'm trying to figure out if I'm supposed to be eating it while I'm pregnant. I know I'm supposed to stay away from fish with a lot of mercury (whatever that means) but does shrimp lie in that category. And I don't feel like this is a question I should be calling my doctor's assistant for so help me out! And hurry because we want to go to Red Lobster tomorrow night for all you can eat SHRIMP!!!!