Be honest about where you are in the relationship. If you're two weeks in,
no, you probably don't have enough information yet to know if this is
the person you want to marry
大概能猜出來If you're two weeks in是指兩個人只在一起兩個禮拜
可是在字典上一直找不到相關的用法
請問這種用法是常見的嗎?

也許跟第一句的 where you are in the relationship 有關，這裡是 If you're two weeks in (the relationship),