So this is probably TMI, but I need some reassurance.

I had sexytimes with a boy; we used some protection, but I often get carried away and forget about it until the last moment (I know it's bad, I am NOT proud of myself). I had a weird period that month, which is not uncommon, and then everything seemed to get back to normal. Since I'm totally paranoid, I took a HPT this morning, even if I'm not late, and the test came back negative (thank GOD), but I'm still worried. If I had the sex six weeks ago, if I was pregnant, the test would come back positive, yes? Because it was a definitive negative, no second line and not even a hint of pink in that window.