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
大概能猜出来If you're two weeks in是指两个人只在一起两个礼拜
可是在字典上一直找不到相关的用法
请问这种用法是常见的吗?

也许跟第一句的 where you are in the relationship 有关，这里是 If you're two weeks in (the relationship),