I'm 17 and I weigh 164lbs. I had unprotected sex in June 18. On Monday. My boyfriend wasn't sure if he came out on time. So I am worried that I might be pregnant. I had my period on June 04 and lasted for about 5-6 days. I'm worried because I believe I have one of the sythomys: fruetly urinating. I took a pregnancy test at home named first responds. Moreover, I took it, first thing in the morning,and it said negative. So I am ask if I could be pregnant.

Much too early to tell.
You will have to wait for your next cycle.