Answer: Hello, I'm happy to help. You should limit how much you eat of these fish to two portions a week. Shark, swordfish and marlin contain much higher levels of mercury, so you shouldn't eat these fish at all while you're pregnant. Instead, you can eat as much as you want of any of the following salmon, tilapia, shrimp, tuna (canned-light), cod, and catfish. You can also confirm this with your doctor before consuming. Hope this information was helpful.