Since we seldom are aware when precisely conception occurs, most doctors agree a pregnancy test should be done when your period is one week late.
40 weeks from conception
Every ones body responds to pregnancy differently. For me, as soon as i get pregnant (about 3 weeks along) i cant eat certain things that i used to, my breast gets really full, and morning sickness.
The earliest you can take a pregnancy test is 2 weeks after sex. It takes 2 weeks until conception has finished.