Normal?

So my period hasn't come and it's 2 weeks late, and I'm more than positive I'm not pregnant because we use condoms I've taken 3 pregnancy test ALL negative. 
By the way, during the summer I would take up at a different time but now since college started I wake up earlier. I'm SUPERstressed over school and my job and I know that can delay it a lot. Oh yea also took plan b 5 days ago there's another factor lol. So pregnant? not ?