Pleasee help!

Keianna

Okay so my last period was June 29-July 3.. me and my boyfriend had unprotected sex and he didnt pull out 3 times... the 13,14 and 15... my ovulation day was July 13th & my period is in 5 days.. but yesterday i took a pregnancy test and it had a very faint line.. and today im experiencing cramps and Diarrhea and lower back pain.. could i be pregnant ??