I am wondering if there is a maximum time after fertilization, after which a pregnancy test no longer works.
On the internet, I can find lots of questions and answers around how early after fertilization a pregnancy test could be positive.
My question is different: what if fertilization happened say 35 days ago. Would a pregnancy test still have good positive predictive value? Do pregnancy tests no longer work after a certain amount of time? How would one test for pregnancy after that time?