Confused and 14 days late help!

Hello, I'm just writing this for some advice and anyone's opinion. So the only other time my period has been late was when I was in my first semester at a college I went to out of state two years ago. I didn't get my period for 6 months. I was still a virgin then, so wasn't that worried. Howvever now that I'm dating a wonderful guy, late periods typically hold more fear. We typically use the pull out method. I'm 14 days late and I've take 3 tests (two yesterday in the evening and one when your actually supposed to take it in the morning). The two from yesterday both came back negative, but the last one only came back with just one line between the two checkers. Just one line in the circle spot. So needless to say I'm confused and need some advice.