TTC 2013- question for you berries!

[name]Hi[/name] Berries,
My boyfriend and I have been talking about TTC this year. But I have a question…after having unprotected sex when is it best to take a pregnancy test? [name]How[/name] early can you take one or do you have to wait till after your missed period? I am due to get my next period the first week of [name]July[/name] which is in two weeks. I am just really anxious which is not helping. So any advice would be really helpful! Thank you.