should I take a test! or wait?

Brittany

So I'm still a week away from my period. but I have been having many early signs of pregnancy, back pain, fatigue, constipation, I'm always hungry and always thirsty. My fiance and I are getting married in three weeks and we wanted to get pregnant after the wedding. but we haven't really been using protection or anything other form of birth control. Should I take a pregnancy test or should I wait till after I see if I start my period?