Start trying for #2 at 18 or 24 months?

Our daughter is almost 15 months and we have started talking more about baby #2. I just got the covid vaccine so in a couple months would be when we would really be serious about it. Would 2.5 age gap or 3 years between be better? or sooner? I have baby fever now but idk if it's just because everyone around me is getting pregnant and having babies haha