How accurate are at home pregnancy tests?

Amariah • In love with God, my husband, and my life.

I'm over a week late and have never been more than a few days late and have never ever missed a period. Since I started when I was 11 it has always come like clock work and I usually get bad cramps before hand.

I haven't had any cramping this month and my breast have been extremely soar but I have taken 2 different at home pregnancy tests and both came back negative.

I'm getting married in two weeks so I was thinking maybe it's stress related why I am late but just wanted some other opinions. I wasn't trying to get pregnant but wouldn't be upset if I was. Just wondering if I should lay off the drinks at the wedding ;)