Tuna subs from subway.. safe?

I have a high risk pregnancy so I’m already worried. I’ve been reading it’s not safe but my doctor never told me to avoid any certain foods. The other day I had a foot long tuna sub, toasted of course. And today I had a 6 inch. I won’t be eating it again for a while but I was reading it can hurt the baby because of Mercury? Anyone’s OB tell them anything about this?

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