Thoughts, Advice, help, anything :/

About 3 days before I was supposed to come on my period, I had unprotected sex with my boyfriend. He didn't finish inside me, but I still took the morning after pill about 12 hours later.
It's been a week since my period was due and I still haven't come on. But I have PMS like symptoms ?
I took a pregnancy test after work and it  was defective so now I'm sitting in agony until I can buy another test tomorrow (all the shops are closed).
Do you think I'm pregnant?