help me!!!!

So I've been taking the BC pill for about 6 days and on the 7th day of taking had unprotected sex! I had sex before I took my BC pill. If I don't take the morning after pill but I want to make sure I don't get pregnant and maybe take a pregnancy test to double check, how long shall I wait to take the pregnancy test for it to be accurate? Bearing in mind I'm not due a period for another 2 weeks?