Advice, could i be pregnant?

2 weeks ago me and my boyfriend had unprotected sex and he came in me.

I was due on my period last week, never came on - done 2 tests on different days; both negative.

Should I do a test next week? Or when should I do one?

Btw I haven't shown any symptoms of pregnancy, I just haven't come on my period.

What do I doooo?