Major Side Effects with Booster if you had NONE with first two doses

Hi,

I am getting a booster next week. I got Pfizer back in May 2021 and had no allergic or sever reaction (No myocarditis). I am now getting Moderna booster next week. Is there possibilities of me getting severe reaction or severe allergic reaction? Or because I didn't get any reaction with the first two doses, I should expect to be fine?

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Male, age 33