Just started on the pill, had unprotected sex, could I be pregnant?

My chemist told me when I started on the pill, 2 weeks ago, that I would have to wait 7 days before it would be effective. However, my boyfriend is in the army and I rarely get to see him, so we had unprotected sex and I hadn't been on the pill for more than 7 days, at the time. I'm due to get my period sometime this weekend... and I'm wondering could I be pregnant? I have been having the usual stomach cramps and headaches so is it possible my period wont be late?

Thanks in advance.
 
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