Can I eat canned tuna while pregnant?

Books and websites with advice from doctors and nurses will say it's okay if you limit it to something like 5 ounces a week... whatever it is, it's not something to eat every single day.  I ate it on occasion with my first pregnancy, and my daughter has 10 fingers and 10 toes.  There's a lot of really irritating old wives' tales out there, but if you're having serious doubts, just ask your doctor.  Chances are, someone has asked them the same question(s) before, and it's safer to hear it coming from them.