Pregnancy test

Hey guys I just wanted to ask u a few questions if possible , I kind of think I'm pregnant but I'm not really sure I want to take the test but allot said that I have to have a missed period in order to take the test and before my missed period time it won't show or be accurate at all is that true? I'm expecting my period 2 weeks later.. and when taking the test allot have told me that it should be the first thing in the morning like the first time you pee in the day ?! And I'm kind of confused