Cod appears in the Best Choices category of the U.S. FDA/EPA fish chart. For pregnancy and breastfeeding, that advice is two to three four-ounce servings weekly from Best Choices, or one from Good Choices. Count the week's fish together, rather than treating the amount as a separate allowance for every species. FDA/EPA chart and servings
CDC's pregnancy food guidance lists raw or undercooked fish as riskier. Its safer option is fish cooked to 145°F, or until the flesh is opaque and separates easily with a fork. A low-mercury chart category does not remove the need for suitable preparation. CDC seafood table
For fish caught by family or friends, FDA advises checking the local fish advisory. If none is available, its advice is only one serving and no other fish that week. That is a separate situation from simply looking up commercially sold cod on the species chart. FDA advisory paragraph
This page does not assign one mercury measurement or nutrient amount to every cod portion. Nor does it promise that cod will relieve nausea or be tolerated by everyone. The chart describes a fish category, not a test result for a particular meal.