Missed period ❗️

Today is the 26th and I was suppose to get my period the 17th. It's over a week late. I took a pregnancy test and it came out negative. This is my first time I ever missed a period. I been sleepy, have headaches and back pains, and also having the feeling I want to faint. I'm not sure when or if I should take another pregnancy test or just wait it out a few more weeks. Any opinions? I am having cramps but it not the same feeling I have when I have my period.