This is from http://www.umm.edu/altmed/articles/omega-3-000316.htm
Fish (and fish oil supplements) may contain potentially harmful contaminants, such as heavy metals (including mercury), dioxins, and polychlorinated biphenyls (PCBs). For sport-caught fish, the U.S. Environmental Protection Agency (EPA) recommends that intake be limited in pregnant or nursing women to a single 6-ounce meal per week, and in young children to less than 2 ounces per week. For farm-raised, imported, or marine fish, the U.S. Food and Drug Administration recommends that pregnant or nursing women and young children avoid eating types with higher levels of mercury (such as mackerel, shark, swordfish, or tilefish), and less than 12 ounces per week of other fish types. Unrefined fish oil preparations may contain pesticides.
This is from: http://www.acog.org/publications/patient_education/bp001.cfm
Fish and shellfish are good sources of protein, omega-3 fatty acids, and other nutrients. However, pregnant women should not eat certain kinds of fish because they contain high levels of a form of mercury that can be harmful to the developing fetus.
You should avoid eating shark, swordfish, king mackerel, or tilefish during pregnancy. These large fish contain high levels of mercury. Albacore tuna also is high in mercury so you may want to choose canned chunk light tuna instead. Other types of fish are fine in limited amounts. You can eat up to 12 ounces (about two meals) of other varied fish and shellfish per week
If you are taking Fish oils for omega 3, I would buy mercury free.
One good brand is: http://www.babyhopes.com/omega3.html
I do not recommend taking higher than 3 tablets per day of Pregnancy Plus Omega3.
I would be careful of taking supplements without your doctor's supervision.
Thank you! i think the ones i have are mercury free, however I will look at that website and get some from there! I appreciate your time greatly!