What is the earliest point after conception that a home pregnancy test can be used to confirm pregnancy?

1 week later
4 weeks later
2 weeks later
3 weeks later

fairly sure its 2 weeks. that's when it can be tested for in urine.

age might have something to do with behavior depending on the age because not everyone who is the same age acts the same like 2 year olds could have bad behavior but some won't.

i hope this : )