Are wrong kind of tuna! Help!

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I just realized that I’ve been eating white, not light, tuna sandwiches every 3 days for the past 6 weeks. I’m 12 weeks, though baby is measuring ahead so I did this while the nervous system was forming. Obviously I’m cutting down and switching to light tuna, but am still freaked out that I could have caused harm to baby nonetheless. Has anyone had any previous experience with this??