Will home pregnancy tests still work a few months or ever all the way through the pregnancy?

What I mean is, is what they are testing for only present in the first month or so of the pregnancy, or will they still work throughout the pregnancy or at least in the first half or so? Would pregnant women who were 2, 4, 7, 8, and 9 months pregnant get accurate results if they used a home pregnancy test? Thank you guys.

What is the minimum pregnancy months required for birth?

I have heard that people have been giving births at 7th and 6th months of pregnancy, what are the side effects?

What pregnancy symptoms would i be experiences by 1 and a half to 2 months pregnant?

Also if i was 1-2 months pregnant what would one of the reasons be to why all pregnancy tests say negative?