What Causes A Delayed Period With Dizziness And Heartburn?

Hello, I am writing to about my concern about my period. It is 6 days late. It is usually on time. me and my partner just use the withdrawal method. I feel very warm, dizzy, faint, ive cramps, headaches, heartburn and feeling tired, very emotional, moody and irritable. i havent taken a home pregnancy test yet.. do u think i may be pregnant?