Please need help

Sylvia

I haven't starting my period since 15 days what should I do does it mean I am pregnant or not should I take a pregnancy test or should I waiting a little bit long to take a pregnancy test I need someone help please and also I been getting these really bad headaches and my back is been really hurting so bad and I been so exhausted lately I never feel like doing anything anymore all I want to do is to sleep 🤔