How far along are you? 是什么意思

how far along are you?
意思是：你有这个（情况）多久了？

当你怀孕去看医生的时候，美国的医生常会问这句话：
how far along are you?
然后你回答：几个星期或几个月 （怀孕时间）

例句：
How far along are you in your pregnancy after your first missed period？
how far along are you when you feel the baby kick？

你去了多远？
along——去到

你顺着走了多远？