Consuming a large tuna portion

Idk why out of nowhere this is really bothering me. Ive already eaten an occasional tuna sub, canned tuna without second-guessing myself but I just smashed an entire cup of tuna salad with crackers for lunch & guilt is tearing me up.

What is the likelihood that I’ve over-done it in terms of mercury consumption? I have no idea what kind of tuna it was, I just know it was canned.