I had sex about two weeks ago and I haven't gotten my period yet, I took a pregnancy test and it was negative. how acurate is a test at two weeks? I took on of those early response brand name ones. I'm actually terrified, I don't know what to do. There were to tests in the box so i'm going ot take another one at the end of the week. but I guess the question is how acurate is the first oen i took after two weeks?